Choose all the answers that apply. Kidneys .

clean waste from the blood
keep water balanced in the body
help the body move
make white blood cells
give the body a sense of touch

The shift of a vehicle's weight around its center of gravity is known as

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

Which of the following explains why a tree is often used as a model to represent the principle of common descent