The influenza virus cause the flu, but not other diseases. why?

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.

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

Explain why ecosystem diversity results in species diversity in a healthy biosphere