Answer: A. There is no association between fluoride exposure and increased cancer risk in humans.
Explanation: just did it.
Your science class has taken swabs throughout the school. The image shows the petri dish containing a bacterial culture that developed from a swab of one computer keyboard in the classroom. You would like to make a detailed observation of the internal structures of the bacteria in your culture. You know that In order to see just their shape, it is necessary to use a magnification of about 400x to 1000x. Based on this, develop a logical argument for using a transmission electron microscope.
The TEM magnifies 1,500,000X and produces a 3D image.
In order to keep the students safe, the bacteria must be dead before viewing with any microscope.
The TEM magnifies up to 2000,000X and you can see great detail including the internal structure of cells.
The TEM produces a 2D image of whatever specimen you are viewing.
A logical argument for using a transmission electron microscope (TEM) is: C. The TEM magnifies up to 2000,000X and you can see great detail including the internal structure of cells.
What is a microscope?A microscope can be defined as an optical device that is typically designed and developed to produce an enlarged (magnified) image of a minute (very small) object, in order to show all the littlest and tiniest details about the object that cannot be seen by the natural human eye.
The types of microscopes.In Science, there are different types of microscopes and these include the following:
Scanning electron microscope.Polarizing microscopeInverted microscopeCompound light microscope.Transmission electron microscope.Ideally, a magnification of about 400x to 1000x is required to see the shape of a bacterial culture. However, a transmission electron microscope (TEM) can magnify up to 2000,000X and as such you can see great detail of a bacterial culture, including the internal structure of their cells.
Read more on microscope here: https://brainly.com/question/21893199
What class of membrane-transport protein is associated with triggering an action potential?.
Answer:
A voltage-gated ion channel
Explanation:
Please help! The best answer gets brainliest! I'll also appreciate it if you explain it! :D
Question: A scientist looking at animal fossils from 400 million years ago might see the first appearance of which organism?
A. insects
B. amphibians
C. jellies
D. land plants
Answer:
B. amphibians
(B) Amphibians
Marty is developing a new way to heat an airplane's windshield to prevent it from accumulating ice when in flight. A thin layer of clear, conductive material is injected between two layers of thick windshield plastic. A very small electric current is run through the inner material to keep the plastic layers warm.
The question part that is missing is -
How might using a model help develop the design?
Answer:
The correct answer would be - it could be tested in a lab.
Explanation:
A model is a smaller representation or test unit for an idea, or a process that is which is used to test or explain the idea or process that can not be made multiple times on a large scale.
Developing a new method to heat an airplane's windshield to prevent it from ice accumulation when in flight, testing this new idea, is very risky in the actual plane during flight so testing this method in the lab on a model would be helpful.
7th grade science
PLEASE HELP MEEEEE!!!!!!!
Answer:
Eukaryotic because it has a nucleus
Explanation:
Where would you find the warmest waters?
deep zone
surface-mixed zone
transition zone
polar zone
Answer:
Surface Mixed Zone, because the warmest is at the surface so it'll get the most sunlight. etc. It *stays* the warmest because warm water is less dense than cool water. Layers in the ocean are very well-defined since the warm water on top will stay warm and the cold water stays cold.
Explanation:
Hope my answer helped :)
A cell undergoes mitosis three times. How many daughter cells are produced?
A. 16
B. 2
C. 4
D. 8
Answer:
B A cell is a undergoes mitosis time
Answer:
8
Explanation:
a cell with 20 chromosomes that undergoes mitosis three times will have 8 daughter cells produced .
8. Which of these is a homogeneous mixture?
A. O milk
B. O tea
C. O sand on a beach
D. O sodium chloride
Explanation:
A. milk is my answer
After Mrs. Kirby received nutritional advice, her neighbor asked for her help with calculating the contribution of energy from fats in her diet. For a long time, her doctor has been telling her to lower the fat intake below 30
%
of her total calories, but she does not really know how to do it--much less how to calculate it.
Mrs. Kirby explained how she did her calculations, and the neighbor showed her "her numbers." Together they came up with total calorie intake of 2200 kcal and 63 g of fat.
What is the percentage contribution of energy from fat in Mrs. Kirby's neighbor's diet?
Answer:
61%
Explanation:
One of the reasons why it is so difficult to quit smoking cigarettes is that nicotine may lead to an increased activation of ________ neurons.
It is so difficult to quit smoking cigarettes is that nicotine may lead to an increased activation of dopamine neurons.
What is dopamine neurons?Dopamine neurons play an important role in the control voluntary movement and behavioral processes such as mood, reward, addiction, and stress.
This nicotine activates the dopamine neurons that begins the response that leads to feelings of pleasure and reward, and then addiction.
Learn more about neuron here: https://brainly.com/question/13061744
Explain how human insulin is produced by genetic
engineering.
Answer:
The first product developed by genetic engineering was human insulin. It can be produced by using recombinant DNA technology. The gene responsible for producing human insulin protein is isolated.
Explanation:
Define a hybrid fish
Answer:
Scientists accidentally bred a hybrid fish called the sturddlefish The sturddlefish is a hybrid of a sturgeon and a paddlefish, and scientists created this new creature on accident. Forward 15 seconds Back 15 seconds
Explanation:
hope it helps
A woman has only daughters. Analyze the situation genetically and provide a suitable explanation.
Answer:
If a woman has only daughters then the father must have passed the X chromosome that fertilised the egg each time
PLEASE HELP
How do algae blooms destroy aquatic life?
depleting oxygen needed by organisms
by raising the water temperature
by getting into municipal water supplies
by giving off toxins that kill life
Answer:
A. Depleting oxygen needed by organisms
Explanation:
When the algae and bacteria in the algae bloom die, the decomposition process uses up most of the surrounding oxygen.
are worm neurons alive????
Answer:
Yes
Explanation:
In the inner-world perspective of the simulation, the worm is absolutely alive as it is obeying the laws of physics as presented by the simulation.
Answer: Yes
Explanation:
Growing to just one millimeter in length, these simple creatures have only 302 neurons, or nerve cells, in their bodies, a tiny fraction of the 80 billion or so neurons in the human brain. ... They found the circuit has "command neurons" that release serotonin to increase movement in the worms.
The ear canal is found on what bone
Explanation:
ear bone, also called Auditory Ossicle, any of the three tiny bones in the middle ear of all mammals. These are the malleus, or hammer, the incus, or anvil, and the stapes, or stirrup.
Answer:
the temporal bone
Explanation:
hope it helps sorry if I'm wrong
What is the evidence that supports the autogenic hypothesis?
Answer:
Explanation:
The hypothesis is supported by the studies on mitochondria. The mitochondria contains its own DNA and sythesizes many of its RNA and proteins. The mitochondrial protein synthesis machine, the ribosomes are similar to those found in bacteria. Similar to the bacterial cells, the mitochondria also contain circular genome
plz mark as brainliest
Question 19
Neurotransmitters are typically stored in which of the following parts of a neuron?
Answer:
Neurotransmitters are synthesized by neurons and are stored in vesicles, which typically are located in the axon ’s terminal end, also known as the presynaptic terminal. The presynaptic terminal is separated from the neuron or muscle or gland cell onto which it impinges by a gap called the synaptic cleft.
Explanation:
Carbon has an atomic number of 6. Carbon 14 has _____.
Answer:
8 Neutrons
Explanation:
For example, carbon has six protons and is atomic number 6. Carbon occurs naturally in three isotopes: carbon 12, which has 6 neutrons (plus 6 protons equals 12), carbon 13, which has 7 neutrons, and carbon 14, which has 8 neutrons.
What would I choose? Please help me!!??
Answer:
I believe your answer is B. Sorry if I am wrong.
Explanation:
I hope I helped
Have an AMAZING day. :)
If fossils of fish and sea shells are found in an area that is now desert, we might assu
that:
• Fish could breathe air at one time in their history.
• Sea shells could live on land millions of years ago.
• The area in which the fossils were found was once covered with water.
• None of the above.
Answer:
The area once contained water.
Explanation:
Fish do not have the anatomical structures necessary for breathing on land. Even if they did, they would likely desiccate in the arid environment of the desert. The same reasoning applies to seashells. As a result, the environment must have been different in order to support the needs of these creatures. Since the Earth's continents are continuously shifting due to plate tectonics, and the Earth's climate changes over time, it would be reasonable to say that the desert was once a body of water that could support marine life.
Which statement is not an example of intercellular communication?
A A message is distributed across plasma membrane.
B A message travels between gap junctions.
C A molecule stimulates a target cell via a receptor.
D An electrical signal causes muscle cells to contract together.
Answer: The answer is A message is distributed across plasma membrane
Explanation:
I took the quiz
Answer: The answer is A message is distributed across plasma membrane
Explanation: trust me :)
I neeed helppppppppp
Answer:
They can live in both warm and cold, but they die faster in warm water.
Hello people ~
Anemophily takes place by:
(a) By Bird
(b) By Bat
(c) By Snail
(d) By Wind
Answer:
(d) wind
Explanation:
Anemophily is the process by which pollen is transported from one plant to another via aer currents. Wind pollinates approximately twelve percent of the world's flowering plants, including grasses, cereal crops, many trees, and the notorious allergenic ragweeds.
I am joyous to assist you at any time.
i need helppp pleaseee
What causes burning rock and gas to explode out of a volcano?
Answer:
the first one
Explanation:
Aquifers are _______. A. Located below the water table b. Important sources of freshwater c. Located in the saturated zone d. All of the above Please select the best answer from the choices provided A B C D.
Aquifers located below the water table, important sources of freshwater, and located in the saturated zone.
What are aquifers?
Aquifers are underground, present layers of rock or sand that bear water.
Aquifers are bodies of permeable rock or sediment that have been flooded by groundwater.
As rainwater penetrates through the earth, groundwater enters an aquifer.
It has the ability to migrate through the aquifer and reemerge via springs and wells.
Thus, the correct option is D, all of the above.
Learn more about aquifers
https://brainly.com/question/10609623
Answer:
Explanation:
the answer is d I got it right
А_________ is any object that orbits a larger object
Answer:
The answer is satellite, give me brainliest answer pls:)
Answer:
An object that moves around another object in space is a
A natural satellite of a planet or asteroid. objects that orbit around a body in space that are not man made. ex. the earth is a natural satellite of the Sun, the moon is a natural satellite of Earth.
Explanation:
The biomolecule described as having many high energy bonds, majority of the cell membrane,
and has more energy per gram than other biomolecules is a
aCarbohydrate
b. Glycerol
C. Fatty acids
d. Amino acids
Alfred Wegener believed that all of the continents were originally: a. a single landmass called Pangaea c. three landmasses called Europe, Asia, and Gondwana b. two landmasses called Eurasia and Gondwana d. none of the above
its A
Explanation: