The variation in living primates provides models for understanding: a. morphology, behavior, and adaptation in the evolutionary past. b. the uses of anatomical and genetic evidence. c. levels of anatomical complexity. d. alternative forms of classification.

Which hypothesis is most supported by astronomers?

The universe is currently expanding and will continue to expand.

Stars could burn out, causing the universe to become dark and cold.

Gravity could pull galaxies back together, causing a reverse of the big bang.

Dark energy will pull the universe together to form a massive black hole.

Explanation:

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products