Compared to the trees in tropical rainforests, the trees in temperate rainforests are generally: A) older B) heavier C) smaller D) younger

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

In what for do plants utilize nitrogen? why do they need nitrogen?

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?