Which statement describes a feedback mechanism involving the human pancreas? 1
The production of estrogen stimulates the formation of gametes for sexual reproduction.
2
The level of oxygen in the blood is related to heart rate
3
The level of sugar in the blood is affected by the amount of insulin in the blood
The production of urine allows for excretion of cell waste

Granite rock is light in color. which feature directly contributes to this color? the process that forms granite the amount of silica minerals in granite the shape of the grains found in granite the unique pattern formed by grains in granite

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

Are the earth's ocean floor and continents the same age geologically? why or why not?