The graph shows that the honeybee population was stable and then decreased. Which statement describes births and deaths when the honeybee population was stable?

• There was the same amount of births and deaths.

• There were more births than deaths.

• There were fewer births than deaths.

• There were no deaths.

The diagram above is called a food web. It shows the relationship between foxes and voles. What does the food web show?

• foxes eat voles

• voles eat foxes

• voles compete with foxes

• foxes compete with voles

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Foxes eat small animals called voles. In southern Sweden, scientists observed that when the vole population decreased, what will happen the fox population?

• Population will decrease

• Population will remain stable

• Population will increase

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A population of Tule Elk lives in Bakersfield. Over 150 years, the size of the Tule Elk population decreased. What best explains the decreased in the size of the Tule Elk population?

• A lot of Tule Elk were born and none of them died.

• The Tule Elk population is always increasing because no animal eats Tule Elk.

• Fewer Tule Elk were born than died.

• More Tule Elk were born than died

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A population of Mountain Lions lives in southern California. Over 20 years, the size of the Mountain Lion population in the region increased. What best explains the increase in the size of the Mountain Lion population?

• The Mountain Lions population is always increasing because no animal eats Mountain Lions

• More Mountain Lions were born than died.

• Fewer Mountain Lions were born than died.

When a populations is known to be STABLE, it:

• there are more deaths

• stays mostly the same, over time

• there are more births

• horses live there

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A resource population is:

• a population that is avoided by organisms

• a population that is traded between organisms

• a population that is eaten by organisms from another population

• a population that is never eaten because it doesn't taste good.

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What do you think would happen to the lion population if the hyena population increases in size? Assume that the populations were stable before this change.

• The lion population would increase.

• The lion population would not change.

• The lion population would decrease.

• The hyena population would increase.

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A ________________________________ is all the living and non-living things interacting in a particular area.

• Populations

• Sample

• Ecosystem

• Organism

In Australia, both opossums and foxes eat rats. The sizes of the populations have been stable for the last 12 years, but recently the size of the opossum population increased. What will likely happen to the fox population?

• increase. An increase in the size of any population leads to an increase in the sizes of all other populations in an ecosystem.

• decrease. Fewer energy storage molecules will be available to the fox population from the smaller rat population, so the fox population will reproduce less. This will lead to fewer births than deaths in the fox population.

• decrease. The larger opossum population will leave fewer energy storage molecules for all other populations in the ecosystem, so the fox population will reproduce less. This will lead to fewer births than deaths in the fox population.

• stay the same. Opossums and foxes do not eat each other, so the number of births and deaths in the fox population will stay the same.

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