The last blue box says “the temperature increases in the center of a nebula, and nuclei begin to fuse. (I couldn’t fit it in the pic) Question: Arrange the events in the life of a star in the correct order.

Which are observations about the tree on the right ,? check all that apply

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.