Which of the following characteristics are expected in the first animals to have colonized land?

I) They were probably herbivores.
II) Animals had four appendages.
III) Animals had the ability to resist dehydration.
IV) Animals had lobe-finned fishes as ancestors.
V) Invertebrates

Cells control gene expression at which steps

What are the three different shapes, or structures, of carbon-based molecules

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.