| A | B |
|---|
| population | a group of organisms that all belong to the same species and that live in a given area. |
| Rapid | Almost any organisms provided with ideal conditions for growth and reproduction will experience a (rapid or slow) increase in its population |
| exponential growth curve | the kind of curve this growth pattern produces on a graph is called an ___ ___. |
| Logistic growth | Most populations go through a number of growth, which can be represented on a ___ ____ curve. |
| steady state | the average growth rate is zer during the ___ ___. |
| carrying capacity | size of a pupulation during the steady state portion of a logistic growth curve |
| density-dependent limiting factors | When factors that control population size operate more strongly on large populations than on small ones, they are called ___-___ ___ ___. |
| True | Density-dependent limiting factors include competition, predation, parasitism, and crowding. |
| competition | When populations become crowded, both plants and animals compete, or struggle, with one another for food, water, space, sunlight, and essentials of life. |
| Predation | When just about every species serves as food for some other species. |
| Parasites | ____ live off their hosts, weakening them and causing disease. |
| True | True or false: Certain species fight among themselves if they are overcrowded. |
| Density-independent limiting factors | factor that controls population size regardless of how large the population is at the time |
| false | True or false: Human populations, like those of all other animals, tend to decrease in size with time. |
| Populations | ___ in communities interact with one another in many ways. |
| Symbiosis | close relationship between two species in which at least one species benefits from the other |
| commensalism | symbiosis in which one member benefits and the other is not harmed. |
| mutualism | symbiosis in which two species live together in such a way that both benefit from the relationship |
| True | True or false: Nearly every ecosystem is connected, either directly or indirectly, with other ecosystems. |
