Which of the following best describes the function of nerves?
a. they send information around to different cells of the body.
b. they connect the brain to the body.
c. they carry messages from the muscles.
d. they carry sensory and motor impulses.

Which are forms of nitrogen that are usable by humans

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

Eutrophication caused by human nutrient pollution.