If you don’t, you’ll either pass out or die.
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.
Answer: Option A
Explanation:
Scientist used the domain Eukarya which comprises the togetherness of all the eukaryotic species. They have been put together because all of the eukaryotic species have their recent common ancestor as eukaryotes.
The first eukaryotic cells, which had nucleus originated 2 billion years ago which had organelles. They explain the endosymbiotic theory.Most of the eukaryotic species that have been evolved from this.
Eukaryotic species have been evolved from another eukaryotic species and share some similar characteristics.
Answer:
plants
Explanation:
because its the only thing that those teeth are used for
