Answer:
46
Explanation:
mitosis creates identical cells so if the mother cell has 46 chromosomes then so will the daughter cells that were formed after mitosis
PLEASE HELP, WILL MARK BRAINLEST TO WHO EVER ANSWERS FIRST
The table below shows the half-lives of four radioactive materials. Radioactive material Half-lives Bismuth-212 60.5 seconds Sodium-24 15 hours Iodine-131 8.07 days Strontium-90 29 years Which of these materials will decay the slowest to one-fourth of its original amount? Bismuth-212 Sodium-24 Iodine-131 Strontium-90
Answer:
Strontium
Explanation:
The materials that will decay the slowest to one-fourth of its original amount is Strontium-90. The correct option is D.
What are half-lives of radioactive materials?The half-life of a radionuclide is the amount of time it takes for half of its radioactive atoms to decay. A good rule of thumb is that you will have less than 1% of the initial amount of radiation after seven half-lives.
Strontium-90 is considered hazardous waste. Because of its 29-year half-life, it can take hundreds of years to degrade to negligible levels. Water and food contamination may raise the risk of leukemia and bone cancer.
Strontium-90 has a half-life of 29 years (the time it takes for half of the strontium to emit radiation and transform into another substance).
Therefore, the correct option is D. Strontium-90.
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Metamorphic rocks is changed into igneous rock by
Answer:
If the newly formed metamorphic rock continues to heat, it can eventually melt and become molten (magma). When the molten rock cools it forms an igneous rock. Metamorphic rocks can form from either sedimentary or igneous rocks.
Explanation:
How many letters in a codon?
Select one:
O 5
o 6
O 3
o 4
Which should be considered first in evaluating the cost of implementing a new technology to increase crop
production?
A reduction in the number of hours needed to harvest the crops
B the amount of seeds that will be produced by the next generation of crops
the amount of crops already produced by farms
D possible negative effects of the new crop technology on the environment
How do lions feed and what type of behaviors do they utilize to obtain food?
Answer:
How the lion feeds: the female lions are called Lionesses they are the members in a pride that hunt, the male Lion just waits for the lionesses to kill the prey and then feeds on it for however long he wants to. The lionesses eat last.
What behaviors they use to obtain food: Lions stalk their prey, although ambush behavior has been observed. They hunt mainly during the evening and at night. You can still find the behavior/ instinct in house cats (stalking/ ambush like movements)
Explanation:
Hopefully this helped :)
can u please give me Brainiest
Nucleic acids are to DNA
as proteins are to...
Answer:
From DNA to RNA to proteins. Many genes encode protein products, meaning that they specify the sequence of amino acids used to build a particular protein.
Which statement is true of recessive sex-linked traits such as color blindness ?
Answer:
colorblidness is carried on the X cromasome. since it is resessive it can be covered up. woman have 2 X cromasomes so both have to have it or she wont be color blind. men only have one X cromasome so its more likely that their just one X can have it
Explanation:
Answer:
Ressesive
Explanation:
Forest Fires are factors because they do not depend on the population.
А density dependent
B density independent
c both are correct
Answer:
I think density dependent.
Why would athletes use sets and reps in their training sessions?
Answer:
Athletes use sets and reps in their training because they need to know the exact amount of training they need to do because too much and too little is bad.
Explanation:
Which of the following organelles were NOT FOUND in animal cells? (CHECK ALL THAT APPLY)
Cell Wall
Plant Cell Membrane
Rough ER
Chloroplast
Small Vacuole
Large Vacuole
(This is 7th grade science).
Answer:
Plant cell membrane, Chloroplast
Explanation:
Mark me as brainliest if i helped u, i really need it:)
How can you tell a eukaryotic cell from a prokaryotic cell just by looking at a photo like this?
Explain the difference between the offspring of sexual
reproduction and the offspring of asexual reproduction.
Asexual reproduction involves one parent and produces offspring that are genetically identical to each other and to the parent. Sexual reproduction involves two parents and produces offspring that are genetically unique. During sexual reproduction, two haploid gametes join in the process of fertilization to produce a diploid zygote.
A child became ill with the measles. Measles is a disease that is highly contagious. The child’s mother did not get sick, even though she and the child were close while the child was ill. State one reason why the mother did not get sick with the measles.
Answer:
she has had it before, so her immune system has built up from it
Explanation:
I hope this helped
Physical exchange between homologous chromosomes (crossover) occurs during metaphase I of meiosis. true false
Answer:
False
Explanation:
Crossing over is a phenomenon unique only to the process of meiosis. It is the process whereby a segment of genetic material is exchanged between the non-sister chromatids of homologous chromosome (similar but non-identical chromosomes from both parent).
Crossing over occurs when homologous pairs lie side by side to form a structure called TETRAD in the PROPHASE I stage of meiosis. Hence, according to this question, it is FALSE as crossing over does not occur in the metaphase stage.
Paurelia
POPULATION SIZE
_ caudatum
2
4
6
8
JO
12
14
16
The graph here shows the population growth curves of Paramecium aurelia and
Paramecium caudatum cultures after they were mixed together. This graph can be used
to illustrate the principle of:
Answer:
mutualism
Explanation:
cuz
virus attaches to cell and ____ DNA/RNA
fill in the blank??? plsss help
Answer:
injects........................
Explanation:
it injects its DNA or RNA to initiate infection
4 Scientists want to know whether your genes or your environment has the biggest influence on your
behaviour
. To answer this question they compare identical twins that were separated at birth with
identical twins who grew up together.
a Suggest why identical twins separated at birth are ideal for these studies.
b What results would you expect if inherited variation turned out to be more important than
environmental variation in determining your behaviour? Pealse short answers I dont have enogh lines
Answer: a. Identical twins who grew up together are essential for these studies so that we can see if environment is really an influence or not. Maybe it could be a different case for each one of them. So by comparing them we can know.
b. The results of inherited variation would be that the offsprings would get the same type of characteristics from their parents while environmental variation is variation causedby the environment like heat, temperature, etc.
Explanation:
Which of the following is NOT an environmental strategy?
a. habitat protection
b. reduce pollution
c. increase water use
d. learn about local issues
Answer:
learn about local issues
Explanation:
is it bad if you eat a red banana? cause im a bit scared D:
Which device is using a motor?
A. A water heater creates heat energy from electric energy
B. A waterfall rotates a waterwheel to turn an axle
C. A body massager uses electric energy to move back n forth
D. A solar charger creates electric energy from the Sun
ANSWER:
C. A body massager uses electric energy to move back n forth
Why can't DNA leave the nucleus?
Because that will risk it getting damaged
Answer:
Actually, it’s not the DNA itself cannot leave the nucleus, but the Chromosome or Chromatin. Because, in the nucleus, DNAs are folded into Chromatin or Chromosome. Chromatin or Chromosome just like a rope, and the DNA just the fiber. It’s the rope cannot escape from the nucleus instead of the fibers.
Explanation:
Multiple Choice
Why is the naming system used in modern taxonomy called a binomial system?
O It is based on study of the natural biome, and is rooted in differences within the biome.
O It is a binary number code, indicating distance from a central ancestral species.
O The binomial terms are derived from imagined biological ideals.
O The system uses 14o names, one to indicate genus and one to indicate species.
Answer: The system uses 14o names, one to indicate genus and one to indicate species.
Explanation: Carolus Linnaeus placed organisms in groups based on their observable features. He also devised a naming system called binomial nomenclature that indicates an organism's genus and species.
hope this helped :D
1. The primary source of energy in most ecosystems is/are
A. autotrophs
B. the sun
C. heterotrophs
D. glucose
2. Which would be an autotroph in a grassland ecosystem?
A. mallard duck
B. prairie cordgrass
C. monarch butterfly
D. muskrat
3. Which of the following best explains why there are fewer secondary consumers than producers?
A. Around 10% of the energy is transferred to support the next trophic level.
B. Heat energy given off from producers kills off primary and secondary consumers.
C. Secondary consumers have less cell processes that need energy.
D. More secondary consumers can absorb radiant energy from the sun.
4. Which tropic level ingests the most biomass in order to receive the energy they need?
A. primary consumers
B. producers
C. tertiary consumers
D. secondary consumers
5. Wolves were reintroduced to Yellowstone National Park in 1995. They began to hunt the abundant elk population, so elk numbers decreased. The elk carcasses provided food for other predators, like foxes, coyotes, and bears, so all of their populations increased. Elk used to overgraze on willow plants; now that willows are growing back, beaver numbers are increasing, because they prefer the slow-moving water that willows cause.
Which of these species is a keystone species?
A. willows
B. elk
C. bears
D. wolves
Answer:
B. the sun
B. prairie cordgrass
A. Around 10% of the energy is transferred to support the next trophic level.
C. tertiary consumers
D. wolves
Explanation:
I just did it.
1) The primary source of energy in most ecosystems is; Option B; The Sun
2) An autotroph in a grassland ecosystem is; Option B; prairie cordgrass
3) The statement that best explains why there are fewer secondary consumers than producers is; Option A; Around 10% of the energy is transferred to support the next trophic level.
4) The tropic level that ingests the most biomass in order to receive the energy they need is; Option C; Tertiary Consumers
5) The species among the given ones that is a keystone specie is;
Option D; Wolves
1) The primary source of energy in virtually all ecosystems is solar energy from the sun. This solar energy is used by photoautotrophs to prepare food. Meanwhile all other organisms are usually dependent on autotrophs for their food.
2) An autotroph is defined as an organism that can produce its own food using light, water, carbon dioxide e.t.c. Therefore, they are called called producers. The only autotroph in the options is Prairie Cordgrass.
3) There are fewer secondary consumers than primary consumers due to the fact that for secondary consumers to be alive, they need to eat a lot of primary consumers. Thus, it means a percentage of the energy which is believed to be around 10% is transferred to support the next autotrophic level.
4) From the given options, the trophic level that ingests the most biomass in order to receive the energy they need is called Tertiary consumers.
5) A keystone specie is a type of specie defined as an organism that helps to determine an eco system. Which means if it is taken out of an eco system, all others are affected. In this example given, the keystone specie is clearly Wolves.
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I need help immediately
Answer:
I think it's C
Please help this is a science question
Anyone know the answer to this please help. I know what the answer to 4 and 6 though.
Answer:
hey :))
Here are ya answers
3 goes to “A disease causing agent”
1 goes to “Tiny sacs within the lungs that exchange oxygen”
2 goes to “A cell that has a membrane bound nucleus”
and lastly 5 goes to “A cell that whos nucleus is not bound to a membrane”
hope i helped ya any :))
Complete the following sentence: Oxygen is taken into cells by the process of.....
Oxygen is taken into cells by the process of simple DIFFUSION.
Simple diffusion is a cellular process by which small molecules (e.g., oxygen and carbon dioxide) pass across the plasma membrane and thus can enter and leave the cell.Simple diffusion always occurs in favor of a concentration gradient, i.e., from a region of high concentration to a region of low concentration.For example, oxygen (O2) molecules move from a region of high concentration in the lungs to a region of low concentration in the blood.This process (diffusion) does not require energy to move molecules across biological membranes.In conclusion, oxygen is taken into cells by the process of simple DIFFUSION.
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3)
****
The picture shows the process of asexual reproduction in hydra. According to the illustration, all offspring are
-
ning
-19
A) genetically varied.
B)
genetically identical to the parent.
slightly similar to the parent.
D)
genetically very different from the parent
Answer:
There is no illustration, but the question can be answered based on general understanding of reproduction. The answer is:
B) genetically identical to the parent.
Explanation:
Reproduction, which is the process by which organisms produce their offsprings, can be done in two major ways namely: sexually and asexually. The asexual reproduction involves only one parent that undergoes division to form two daughter cells.
Since there is no exchange of genetic material between two parties as it involves only a single organism, the offsprings will be GENETICALLY IDENTICAL to the parent cell. This is the case of Hydra in this question that underwent asexual reproduction. All of the offsprings of this mode of reproduction will be GENETICALLY IDENTICAL i.e. have the same genetic composition as their parent.
These sunflower seeds have sprouted and are growing tall The seeds need energy to grow. The seeds can make their own food
using water, carbon dioxide and
The end result is sugar or glucose that plants use as food,
A)
air
B)
soil
oxygen
D
sunlight
soil and oxygen sorry if it's wrong
What do plants need in order to carry out photosynthesis?
Answer:
To perform photosynthesis, plants need three things: carbon dioxide, water, and sunlight. for photosynthesis. Carbon dioxide enters through tiny holes in a plant's leaves, flowers, branches, stems, and roots. Plants also require water to make their food