You have finished performing a procedure in the biology lab and now need to dispose of a plastic test tube that contains the sample starch solution you were testing. which waste container should you use?

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.

Apopulation of black bears depends on salmon from a stream for food. if a drought causes the stream to run dry one year, how will this likely impact the black bear population?

This is a situation in which genes are attached to an organism's sex chromosomes; the sex of an organism influences the expression of a gene.