The keystone species is the one at the bottom of the pyramid, if we look at it like a pyramid. If the grass dies, then the deer cannot get food and die, and the predator cannot eat and dies, and the whole ecosystem can fall apart.
Flu vaccines need to be revised and changed every year because the flu virus constantly mutates. Flu viruses can change in two ways: drift or shift. Antigenic drift occurs when genes of the virus slowly change during replication until the immune system no longer recognizes it. On the other hand, antigenic shift occurs when a major change in the virus happens. This usually leads to a totally different kind of virus. This is what happened during the H1N1 scare in 2009.
DNA viruses like mumps are less prone to mutation due to the presence of DNA polymerase. RNA viruses are more prone to mutation because they undergo reverse transcription to simulate the role of DNA.
Hey there!
Here is your answer:
<u>The proper answer to this question is option B "consumers".</u>
Reason:
<u>Producers are organisms like plants they produce food for other organisms. (Plants) Consumers are organisms that eat other organisms. (Some insects, mammals, etc) Decomposers are organisms that decompose on raw flesh, or grow on fertilizer. (fungi) </u>
Also...
<u>Crickets would be consumers because they eat plants and plants are organisms therefore the cricket is consuming the plant. </u>
Therefore the answer is B.
If you need anymore help feel free to ask me!
Hope this helps!
~Nonportrit
DNA is made up of deoxyribose sugar while mRNa is made up of ribose sugar. DNA has thymine as one of the two pyrimidines while mRNA has uracil as its pyrimidines base. DNA is present in the nucleus while mRNA diffuses into the cytoplasm after synthesis. DNA is double stranded while mRNA is single stranded.
Hope this is helped ;)
