Animal Population

In North America, both bears and eagles eat trout. The sizes of the populations have been stable for the last 9 years, but recently the size of the eagle population decreased. What will likely happen to the bear population? The size of the bear population will . . .

• increase

• stay the same

• decrease

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

A population of mice lives in the northeastern United States. Over the last 50 years, the size of the mouse population decreased. What best explains the decrease in the size of the mouse population?

• Fewer mice were born than died.

• A lot of mice died and no new mice were born.

• More mice were born than died.

• The mouse population is always decreasing because mice are always being eaten.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

In the Arctic region, polar bears eat seals, and seals eat cod (a type of fish). In the last 7 years, the sizes of all the populations stayed stable, but recently the size of the polar bear population decreased. What will likely happen to the cod population?

The size of the cod population will . . .

• increase

• stay the same

• decrease

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-3

NGSS.MS-LS2-4

As the number of gray wolves in Yellowstone increases, the number of elk ____________.

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-4

Cause and Effect. Look at the Food Web.

Due to hunting and competition from the bears, wolves and mountain lions, the coyote has died out. What is the likely effect on the rabbit population?

• The rabbit population will increase in numbers.

• The rabbit population will die out too.

• The rabbit population does not change.

• The bears will eat the rabbits.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

Predation is ... (check all that apply)

• Lice live on a person’s head

• Mountain lions eat deer

• Ladybugs eat aphids

• Vultures eat the remains of an animal killed by a mountain lion

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Name the interaction.

• Parasitism

• Mutualism/Commensalism

• Predation

• Competition

Tags

NGSS.MS-LS2-2

Name the interaction.

• Parasitism

• Mutualism/Commensalism

• Competition

• Predation

Name the Interaction.

• Mutualism/Commensialism

• Parasitism

• Predation

• Competition

Tags

NGSS.MS-LS2-2

Cause and Effect. Look at the food web. Due to hunting and competition from the bears, wolves and the mountain lions, the coyote has died out. What is the likely effect of it on the grass?

• The amount of grass is likely going to decrease because there are more rabbits eating it.

• The amount of grass will likely increase now that there are more rabbits eating it.

• The amount of grass will likely remain the same.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4