Carbon, nitrogen, and phosphorus are examples of Choose... reservoirs, compounds, sediments, nutrients
that organisms need to stay alive. Nitrogen can be the
Choose... biogeochemical cycle, unnecessary element, nutrient reservoir, limiting nutrient
in an ecosystem when its available forms are in short supply.

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.

The body of water found at number 4 on the map above is the

To sciences do not agree on which type of grocery bag is better for the environment what is most likely to come out come out of the disagreement