Which of the following is a situation in which a density-independent factor influences the size of a population? A. The effect of disease that spreads throughout a forest of pine trees.

B. The effect of pesticides running off of a field into a waterway on populations of aquatic insects.

C. The effect of intense infestation of deer ticks on a population of white-tailed deer.

D. The effect of overgrazing by cattle on a prairie.

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.

How do living things obtain phosphorus

Idon’t understand and i need the answer! you