The single largest threat against a river ecosystem is ___________.
a) pollution
b) silt
c) muttering
d) ransom
e) estuary
Answer:
a) pollution
Explanation:
Multiple environmental stressors, such as agricultural runoff, pollution and invasive species, threaten rivers that serve 80 percent of the world's population. These same stressors endanger the biodiversity of 65 percent of the world's river habitats putting thousands of aquatic wildlife species at risk.
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Explain. How mitotic cell division results in more cells that allow growth of the organism, can differentiate to create different cell types, and replace dead cells to maintain a complex organism.
Answer:
The mitotic cell division results in more cells that allow growth of the organism because of mitosis. Mitosis is when a single cell divides into two identical daughter cells. The major purpose of mitosis is for growth and to replace worn out cells.
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Explanation:
One recent approach to vaccine development has been production of peptide vaccines. In these vaccines, antigenic peptides are injected instead of whole bacteria or viruses. Peptide vaccines have not been particularly useful against viral pathogens because viral infections require a CD8+ T cell mediated immune response. Why is a peptide vaccine unable to create such a response?
Answer:
Explanation below
Explanation:
Immunization is the process of protecting the body from infections. This can be divided into two, namely
1. Natural immunization
2. Artificial immunization
Natural immunization is the one that is being developed by the body naturally, to protect the body from infections. This is usually known as the white blood cells.
Artificial immunization is being developed through the introduction of atenuated organisms into the body, so that the body can react by producing antibodies against that infectious organisms. This is known as vaccination.
The peptide vaccines have been developed for the body to be able to produce antibodies against some infections.
It should be noted that, owing to the relatively small size of peptides, they are often weakly immunogenic by themselves and therefore require carrier molecules, to add chemical stability and adjuevating for the induction of a robust immune response.
If two organisms have similar rrna sequences, you can conclude that they.
Answer:
evolved from a common ancestor
Explanation:
If two organisms have similar rRNA sequences, you can conclude that they: evolved from a common ancestor.
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Name the system- name as many human body systems as you can. ( don’t use internet)
Answer:
integumentary
circulatory
nervous
lymphatic
skeletal
muscular
Explanation:
im so sorry this all i know from the top of my head
what properties DO NOT require a tool?
1. Cleavage
2. Hardness
3. Luster
4. Carbonate Content
Answer:the correct answer is luster
Explanation:took the quiz made a 100
a reflected light glow: sheen specifically: the appearance of a mineral's surface dependent on its reflecting qualities the luster of polished metal
What does it mean by luster?a reflected light glow: sheen specifically: the appearance of a mineral's surface dependent on its reflecting qualities the luster of polished metal The luster of the stars: a glow of light from within. b: radiance is an inner beauty.Glossy paper is extremely shiny, whereas lustre paper is semi-shiny. Glossy prints have more vibrant colors. A lustrous finish, on the other hand, reveals more accurate skin tones. A lustrous finish is also less susceptible to fingerprints, smudges, and scratches.To learn more about : Luster
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What would happen to the plant population if the caterpillar population decreased?
Answer:
it was increase
Explanation:
NEED HELP!
Why would the shrimp in the ecosphere die if there was no sunlight?
Answer:
The shrimp would die wthout sunlight because they eat algae and algae live on the water's surface. Algae undergo photosynthesis and for photosynthesis to occur, sunlight is necessary. If there is no sunlight, there is no algae. And without the algae around the shrimp no longer have anything to eat. Therefore, without the sunlight (and algae) the shrimp will not be able to survive.
Explanation:
^
Which lists three living units of the human body in order from the simplest to the most complex level of organization?
A. red blood cell → circulatory system → blood
B. nervous system → nerves → brain
C. red blood cell → heart tissue → circulatory system
D. bone tissue → skeletal system → bone
Answer:
C
Explanation:
Cell to tissue to organ to organ system to organism
Answer:
The correct answer is
(B.) nervous system → nerves → brain
Explanation:
The major levels of organization in the body, from the simplest to the most complex are: atoms, molecules, organelles, cells, tissues, organs, organ systems, and the human organism.
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1. Which property allows water to remain in liquid form at high temperatures?
A. Density
B. Polarity
C. Surface Tension
D. Electrical Conductivity
Answer:
polarity
Explanation:
Mkk nnenenrnenenrn rnrntnr t r t r. R r r f r r r r r r e r r
Answer:
Yes my dude just yes
Answer: What are you saying
Explanation:
what are the levels of organization in a living thing
Answer:cells
Explanation:cells
Marcie is writing an article on the Big Bang Theory. What fact should she include in it? A. The universe started expanding after the Big Bang. B. The universe started shrinking after the Big Bang. C. The universe coalesced into one solar system after the Big Bang. D. The universe ended at the Big Bang.
Answer:
C. The universe coalesced into one solar system after the Big Bang.
Explanation:
This is true because, since she is writing about Big Bang theory, she would have to include how the universe was able to expand to one solar system made up of different planetary bodies. This explanation would help someone reading her writeup to understand what the Big Bang theory is all about.
Answer:
C
Explanation:
The correct answer is (C) because Marcie has the simple information but she is missing how the the (Big Ban) happened
You have learned about how to sample a population and estimate size from density. In this
activity, you will: construct a model of a population, sample the population to determine its
density, then use its density to determine its size.
Part One: Construct the Model
Materials
1 piece of 8.5 by 11 in. letter paper
1 pen or pencil
1 ruler
50 small dry beans or other small objects such as buttons
1 small cup
Directions:
1) Use your pen or pencil and ruler to divide the paper into four equal sections.
2) Place the 50 beans into a small cup.
3) Scatter the beans as evenly as possible over the entire paper, making sure to get some of
the beans into each section.
Student Name:
Modeling Population Size
Part Two: Use the Model to Estimate the Size of the Population
In your model, each bean represents a starfish and the paper represents its ocean floor habitat.
1) Within the habitat, choose one of the four sections and count the number of starfish in that
section.
2) Use your ruler to measure the dimensions of the section you chose and calculate the area
that you sampled.
3) Calculate population density based on your sample.
4) Use your ruler to measure the dimensions of the entire habitat and calculate the total
habitat area.
5) Use your calculated population density and total area to estimate total population size.
6) Compare this estimation to your known population size (50). Did you under‐ or
overestimate based on your sample?
2. Make separate shopping lists for 2
meals that are low in sugar and saturated fat.
Answer:
cheesy scrambled eggs:
carton of eggs
salt
pepper
fat free cheddar cheese
non fat cooking spray
fat free margarine
sugar free whole wheat bread
chicken pasta salad:
fusilli
olive oil
red wine vinegar
Tabasco
red onion
cherry or baby plum tomatoes
chicken breasts
basil Explanation:
what type of restriction enzymes are used in genetic engineering to mend DNA segments together ?
What occurs during the latent period of these isometric contractions.
Answer:
The latent period refers to the period of time, in which no force is generated, that elapses between the generation of an action potential and the beginning of muscle contraction. The contraction phase begins at the end of the latent period and ends at the peak of muscle tension.
Explanation:
:)
During the latent period of isometric contractions, there is no visible change in muscle length. It is the time period between the initiation of a stimulus and the actual start of muscle contraction.
Here is a step-by-step explanation of what occurs during the latent period:
1. The stimulus is received by the muscle fiber, either from a motor neuron or an electrical impulse.
2. The stimulus triggers the release of calcium ions from the sarcoplasmic reticulum.
3. Calcium ions bind to troponin, causing a conformational change in the troponin-tropomyosin complex.
4. This conformational change exposes the binding sites on actin for myosin heads.
5. ATP is hydrolyzed by myosin, providing energy for the myosin heads to bind to actin.
6. Cross-bridge formation occurs, where myosin heads attach to actin filaments.
7. However, during the latent period, there is no visible shortening or movement of the muscle fiber.
8. This is because the force generated by the myosin heads is balanced by an opposing force within the muscle, preventing any visible movement.
9. The opposing force is created by the tension in the series elastic elements of the muscle, such as the tendons and connective tissues.
10. This tension allows the muscle to maintain a stable position and prepare for the upcoming contraction.
11. The latent period typically lasts for a few milliseconds, depending on the type of muscle and the intensity of the stimulus.
12. After the latent period, the muscle enters the contraction phase, where the myosin heads continue to bind and detach from actin, causing muscle shortening and generation of force.
In summary, the latent period of isometric contractions is the time between the stimulus and the start of visible muscle contraction. During this period, the muscle prepares for contraction by releasing calcium ions, allowing myosin to bind to actin. However, there is no visible movement because the force generated by the myosin heads is balanced by an opposing force within the muscle.
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Raquel tends to get extremely upset if she does not get her way, and she feels that it is a reflection of how much of a failure she is bound to be. raquel would most likely benefit from __________. a. systematic desensitization b. family therapy c. rational-emotive behavior therapy d. aversion therapy
Rational-emotive behavior is about the therapy needed to cool down the mind and Raquel tends to get extremely upset so for her the correct answer is option c. rational-emotive behavior therapy.
Find methods to reply to conditions that are practical and now no longer a reaction to irrational thoughts.Recognize that despite the fact that they can't manipulate the activities of life, they have got the cap potential to pick out their manner of responding and coping with tough conditions.What is rational-emotive behavior therapy?
REBT is an action-orientated method it truly is centered on supporting humans with ideas addressing irrational ideals and discovering ways to manipulate their emotions, thoughts, and behaviors in a healthier, extra practical manner. According to REBT, our cognition, emotions, and conduct are connected.
Thus it is clear that rational-emotive behavior therapy is Raquel would most likely benefit.
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Answer:
C
Explanation:
Which kingdom has members that lack major organelles such as endoplasmic reticulum, mitochondria and Golgi bodies?
A) Bacteria
B) Protist
C) Fungi
D) Plantae
Answer:
A, Bacteria
Explanation: Prokaryotic bacteria are very simple and lack organelles like ER, mitochondria, Golgi, etc.
WILL MAKE BRAINLIST IF CORRECT HELP FAST PLEASE 20 POINTS!!!! Which soil is made of 25% sand 25% silt and 50% clay?
The soil which is made up of 25% sand, 25% silt, and 50% clay is known as loamy soil.
What are the characteristics of soil?The characteristics of soil are as follows:
Soil is typically composed of organic matter and small inorganic matter.It is significantly composed of minute rock fragments and is the roughest in texture. It possesses a broad characteristic of texture, structure, porosity, chemistry, and color. It generally consists of air, water, and moisture.According to the context of this question, the loamy soil significantly consists of 25% sand, 25% silt, and 50% clay. This is because it is the only soil that possesses a mixture of sand, clay, and silt.
Apart from this, it also consists of 50% pore spaces and water. The presence of an equal amount of soil particles of various sizes imparts enough pores to loamy soil to facilitate water drainage.
Therefore, the soil which is made up of 25% sand, 25% silt, and 50% clay is known as loamy soil.
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Golgi apparatus meaning
Answer:a complex of vesicles and folded membranes within the cytoplasm of most eukaryotic cells, involved in secretion and intracellular transpor
Explanation:
Answer:
a complex of vesicles and folded membranes within the cytoplasm of most eukaryotic cells, involved in secretion and intracellular transport.
happy to help
Explanation:
can i get some help on this please
how much food is required for a blob to reproduce from one generation to another
A: 1
B: 2
C: 3
D: 4
Answer:
Reproduction is achieved from a single cell type, if the organism itself consists of many cell types because each cell that reproduces has a similar DNA in an organism.
A blob to reproduce from one generation to another is option "A" which is 1.
Reproduction is achieved from a single cell type if the organism itself consists of many cell types because each cell that reproduces has a similar DNA to an organism.
What is reproduction in living things?
Reproduction occurs when an organism makes a copy of DNA and produces offspring. All living things on Earth are a process of reproduction.
Thus, option "A" is 1.
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mutations!
1. Mutations are changes in DNA which can sometimes change the DNA
I
2. Mutations can be
or be caused by exposure to harmful
or
Anything in the environment that can cause a mutation is called a
3. Only mutations in
(egg and sperm) can be passed on
Type of mutations
4
mutation is when a base is
or substituted with another base.
5. A
mutation is a deletion or addition of one or more bases that changes how you
the message
6. A deletion is when a base is
and an addition is when a base is
7. If you change the DNA or RNA code it can change the
and
Mutations can be good, bad or have no effect.
8. Good example: Bacteria that are
to our drugs
9. Bad example:
anemia and
cancer
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cms
S
US 1:04
Answer: TYSM!!! FOR HELPING PEOPLE!
Explanation: UR GREAT AT THIS STUFF :) sorry lol its in caps
TWO FUNCTIONS OF CELL DIVISION FOR MULTICELLULAR ORGANISMS AND GIVE AN EXAMPLE FOR EACH FUNCTIOM
Answer:
Two functions of a cell, which are involved in the cell division are: Nucleus – It is the control centre of the cell. Chromosomes are present inside the nucleus.
EXAMPLE: Nuclear membrane disintegrates during division and reforms after the division.
Explanation:
The major blood vessel of the upper arm is know as the _____ artery which is a continuation of the axillary artery
A. Exertion
B. Artery
C. Systolic
D. Brachial
Answer:
Brachial Artery
Explanation:
Upper Arm: Brachial Artery. The brachial artery is a continuation of the axillary artery past the lower border of the teres major. It is the main supply of blood for the arm.
Answer:
D.
Explanation:
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12.) Latitude and longitude coordinates are used to determine
A. An exact location on Earth without the use of landmarks or addresses
B. The depth of the water at that point
C. The distance from one point to another
D. The temperature and climate of an ecosystem
13.) The deepest place in the ocean is found in the Pacific Ocean and is called what?
A Great Pacific Reef
B. Marianas Trench
C.Japan Trench
D. Abyssal Plain
Answer:
D
Explanation:
Emerging viruses that infect human cells can originate from __________. View Available Hint(s)for Part A poor hygiene a rapidly mutating lytic phage lambda viruses that were previously confined to bacterial populations that can now spread due to technological changes a virus spreading from one host species to humans
An emerging virus result from a rapidly mutating lytic phage lambda viruses that were previously confined to bacterial populations that may from technological changes.
What are emerging viruses?An emerging virus refers to an entirely new virus that does not have a previous record of infections in the past. In short, an emerging virus is a novel virus.
One of the possible origins of an emerging virus is a rapidly mutating lytic phage lambda viruses that were previously confined to bacterial populations that can now spread due to technological changes.
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What is a proper hypothesis to guide your experiment?
Answer:
hope it helps...
Explanation:
When conducting scientific experiments, researchers develop hypotheses to guide experimental design. A hypothesis is a suggested explanation that is both testable and falsifiable. You must be able to test your hypothesis, and it must be possible to prove your hypothesis true or false.