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.
Insects has repeated modular segment that develop independently of each other promoted their diversification and evolutionary success. They are able to evolve appendage that are specialized for diverse functions.
Hypotheses propose that insect diversity either result form low extinction rates and resilience to mass extinctions and acquisition of key innovation that allowed them to radiate into newly formed niches.
There exoskeleton characteristics are commonly responsible for the diversification of insects on land. These insects are the amazing diversity in the surrounding , it believed that insects are so successful because they have protective shell /exoskeleton , they have small in size and they can fly.
To learn more about the insect diversity here
brainly.com/question/10756589
#SPJ4
Answer:
answer is the 1st option (A)
It would be Kinetic Energy Hope this Helps :)
Latitude or distance from the equator – Temperatures drop the further an area is from the equator due to the curvature of the earth. In areas closer to the poles, sunlight has a larger area of atmosphere to pass through and the sun is at a lower angle in the sky.
