The lowermost portion of the atmosphere where most weather occurs is called the

The color of the fur is the genotypephenotype. the genetic combination of alleles that determine the fur color is called the genotypephenotype.

Why do mountaineers become breathless as they reach high altitudes

1. an enzyme is considered a(n) because it speeds up a chemical reaction without being used up.2. in a catalyzed reaction, a reactant is often called a(n) . an enzyme is specific because the shape of its matches only particular reactants.4. an enzyme speeds up reactions by lowering the . the between an active site and its substrate often strains bonds and the reaction proceed.6. a( , which is often a vitamin, binds to an enzyme and plays a role in catalysis.7. high temperatures or changes in ph can an enzyme, causing it to lose its shape and biological activity.