U4W2 Review

In a population, organisms are constantly...

• A) growing and reproducing.

• B) migrating and hibernating.

• C) being born and dying.

Which of the following represents a population?

• all of the trees, flowers, insects, and soil in Central Park.

• all of the oak trees in Central Park.

• all of the water bodies in Central Park.

What are the essential components of an ecosystem?

• all of the plants and animals

• all of the living and nonliving things

• all of the soil and water

A system can be stable even as things are being added to and removed from it.

• True

• False

What condition is necessary for a population to be stable over time?

• The number of births and deaths must be equal over a period.

• The number of births must exceed the number of deaths over a period.

• The number of deaths must exceed the number of births over a period.

What factors can lead to a decrease in population size?

• If there are more births than deaths in a given time.

• If there are more deaths than births in a given time.

• If there are the same amount of births and deaths in a given time.

How can a population increase in size?

• If there are less births than deaths in a given time.

• If there are more births than deaths in a given time.

• If there are the same amount of births and deaths in a given time.

What do scientists call a representative part that reflects the characteristics of the whole?

• portion

• sample

• snippet

The size of the moon jelly population in Glacier Sea increased because ____.

• the number of births was greater than the number of deaths

• the number of deaths was greater than the number of births

• the number of births was equal to the number of deaths

Within a population organisms are always...

• A) being born and dying.

• B) eating and sleeping.

• C) talking and working.