Compare the thickness of the wall of the superior and inferior vena cava and the aorta. which thicker and why

Which type of organism is missing from the food web seen in the illustration? primary consumers decomposers primary producers secondary consumers

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

Development of new communities in disturbed environments, such as a burned or a clear cut forest, is called