Until recently, the land snails of the Hawaiian Islands were largely restricted to a single valley. Because snails move only short distances, the high ridges that surround the valley were effective barriers to their dispersal, and about 1,000 species of land snails evolved. This illustrates how speciation rates are

1. environmental factors, such as ph and temperature, can affect the function of an enzyme. a. true b. false 2. which of the following is an organic molecules (ex. vitamins) that an enzyme? a. coenzyme b. product c. active site d. substrate 3. how do enzymes effect the speed of a chemical reaction? a. they speed it up b. they slow it down c. they have no effect on the speed of a reaction 4. during a chemical reaction, an enzyme is used up so that it can only be used one time. a. true b. false 5. which of the following results from a chemical reaction that is catalyzed by an enzymes? a. active site b. product c. substrate d. coenzyme

What abo controlling alleles could kim give her child

Diagram of the evolution of land plants?