Asap extra points you get a flu shot this year, but next year you have to get another because the flu virus has changed over time and your body is not able to protect you against the new virus. the change in the flu virus is an example of select one: a. wallace theory b. evolution c. artificial selection d. viral strategy

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?

Vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a.) antibody, antibiotic b.) antigen, antibody c.)antibiotic, antibody d.)antibody, antigen