dixonmckenzie1429
15.11.2019 •
Biology
I’ll put you as brainliest
vaccines for certain viral infections, such as those for smallpox and measles, may remain effective for many years. however, vaccines for other viral infections, such as those for influenza, are usually effective for one season . which statement best explains why influenza vaccines are effective for a short period of time?
a) the influenza virus is much stronger than other viruses, rendering the vaccine ineffective over time .
b) the influenza virus mutates faster than other viruses, leading to new viral strains not present in the vaccine .
c)the vaccines for influenza are weaker than other vaccines, causing antibodies to ignore an immune response.
d) the vaccines for influenza have an expiration date, causing them to be ineffective after a short time
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Ответ:
Ответ:
The correct option is A. they evolved from land mammals.
Explanation:
The process of evolution explains how closely one organism is to another based on their common ancestors. Scientists believe that those organisms which show many similarities in their structures or functions might have evolved from a common ancestor in the past.
As in the above-mentioned question, scientists have observed that cetaceans lack gills and breath air, this is a property of land mammals. The cetaceans have fin bones which are similar to the limb bones. As limb bones are present in land mammals, hence they cetaceans and land mammals might have common ancestors in the past.