B) is the correct answer. The flu virus does not have the same genetic makeup each year as with each individual it infects its rapidly mutating.
Explanation:
mice can bite the elephant's trunk and/or feet and they can get the elephants a surprise.
Solar eclipse
Ignore this need to get 20 characters
Biotic Factors are any living components that affect other organisms, and since soil is not alive (soil is an abiotic factor) then you can eliminate A., B., and C. D is the answer choice that has only biotic examples.