There are over 2,000 different enzymes in the human body. which statement best describes why it is necessary for there to be so many different kinds of enzymes? a. some enzymes will not react with any type of substance. b. each enzyme catalyzes only a certain reaction or set of reactions. c. all enzymes can catalyze any reaction in the human body. d. enzymes are constantly being used up in reactions.

What is the first step in a life cycle of a plant reproduce sexually

Body systems are not completely independent they integrate and work together describe one example of the integration between body systems

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area