Question

content practice b
lesson 2
changing populations
directions: on the line before each statement, write t if the statement is true or f if the statement is false. if the statement is false, change the underlined word(s) to make it true. write your changes on the line provided.
__ 1. a population’s exponential growth is the number of offspring produced over a given time period. __
__ 2. a population’s carrying capacity is the number of individuals that die over a given time period. __
__ 3. if the birthrate is higher than the death rate, the population increases in size. __
__ 4. lack of food, natural disasters, disease, and predation are reasons why a population might decrease in size. __
__ 5. a population grows in a pattern called exponential growth when it is in ideal conditions with limited resources. __
__ 6. an endangered species is a species that has died out and no individuals are left. __
__ 7. a threatened species is a species whose population is at risk of extinction. __
__ 8. an extinct species is a species that is at risk but is not yet endangered. __
__ 9. migration is the seasonal movement of a population of organisms from one place to another. __
__ 10. humans have developed ways to increase the carrying capacity of their environment. __
__ 11. birthrate, death rate, and movement are the three causes of changes in the human population size. __
populations and communities
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Explanation:

1. A population's birthrate is the number of offspring produced over a given time period. So, the statement is False.
2. A population's carrying capacity is the maximum number of individuals that an environment can support. So, the statement is False.
3. If the birthrate is higher than the death rate, more individuals are being born than dying. So, the population increases in size. The statement is True.
4. Lack of food (limiting resource), natural disasters (external force), disease (health - related), and predation (interaction with predators) can all lead to a decrease in population size. The statement is True.
5. A population grows in a pattern called exponential growth when it is in ideal conditions with unlimited resources. So, the statement is False.
6. An extinct species is a species that has died out and no individuals are left. So, the statement is False.
7. A threatened species is a species whose population is at risk of extinction. The statement is True.
8. An endangered species is a species that is at risk but is not yet extinct. So, the statement is False.
9. Migration is the seasonal movement of a population of organisms from one place to another. The statement is True.
10. Humans have developed ways (e.g., agriculture, technology) to increase the carrying capacity of their environment. The statement is True.
11. Birthrate (number of births), death rate (number of deaths), and movement (immigration and emigration) are the three causes of changes in the human population size. The statement is True.

Answer:

1. F, change "exponential growth" to "birthrate"
2. F, change "carrying capacity" to "death rate"
3. T
4. T
5. F, change "limited" to "unlimited"
6. F, change "endangered" to "extinct"
7. T
8. F, change "extinct" to "endangered"
9. T
10. T
11. T