Activities Key Terms Quizzes Art Chapter 41 Self-Quiz
Unit 6: Interaction with the Environment Growth of Populations Review
  1. A is a group of individuals of the same species that live in the same geographic location.
  2. Populations change in size over time. Unless reproduction is checked in some way, a population will exhibit a curve of growth, but environmental limits place prevent populations from exceeding the capacity, and they usually stabilize at a curve, where birth and rates are balanced by death and rates.
  3. species often experience an initial exponential growth due to lack of or .
  4. Removing an species can also allow native species to rebound in a recovery curve.
  5. Some populations undergo cycles of growth and decline due to or limits.
  6. Excessive populations can degrade the environment and reduce its capacity, leading to a population ; an example is the reindeer on St. Matthew Island.
  7. Habitat fragmentation may also have an effect on population size, often in an unpredictable fashion.
  8. World human population growth is currently , but this pattern cannot be sustained indefinitely. Eventually, either we will place limits on ourselves that curb population growth, or the environment will do it for us.
  9. Settlement Transformed Wisconsin's Sand Country
  10. A Miserable Life on Overcrowded Earth in 2100

Activities Key Terms Quizzes Art Chapter 42 Self-Quiz
Unit 6: Interaction with the Environment Interactions among Organisms Review
  1. The focus of ecology is on interactions between and their , including other organisms.
  2. Interactions between two species where both benefit is called , or . Examples include bacteria that live within the cells of aphids, mealybugs, and whiteflies and help the insects digest plant sap. In turn, these plant suckers are often protected by which "milk" the "honeydew" secreted by the insects.
  3. mutualism occurs when each species depends on the other for reproduction. An example is the which actively pollinates the Yucca plant to ensure that its larva will have seeds to eat.
  4. Interactions where one species benefits and another is harmed are called interactions, and include 2 major kinds: and . Predators usually their prey, while parasites often feed upon their without killing them. Consumers can be a strong on victims to evolve defensive mechanisms. Examples include the spines on and , and the prickles of .
  5. Competition occurs when both species in an interaction share a . Competition between similar species can lead to so that each species can exploit a different resource.
  6. Species may compete directly by preventing access to resources ( competition), or indirectly in a race to share limited resources ( competition).
  7. New Water Flea Invades Southern Lake Michigan
  8. Wolves Decline, Moose Increase in Isle Royale National Park
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