8.L.3.2

Fleas harm cats and dogs by living off their blood. Which type of relationship is this?

• Cooperation

• Mutualism

• Parasitism

• Predator/Prey

Populations of wolves and rabbits in and ecosystem are represented by the graph provided. Which best explain the relationship between wolves and rabbits in the ecosystem?

• As the numbers of rabbits increases, the number of wolves increases.

• As the number of rabbits increases, the number of wolves remains constant.

• As the number of rabbits decreases, the number of wolves increases.

• As the number of rabbits decreases, the number of wolves remains constant.

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NGSS.MS-LS2-2

NGSS.MS-LS2-1

What is occurring when a variety of organisms live together in the same colony?

• Co-Existence

• Competition

• Homestasis

• Habitat

In which ecosystem would competition most likely occur among a population of a species?

• A land ecosystem.

• A large ecosystem.

• A small ecosystem.

• A water ecosystem.

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NGSS.MS-LS2-4

Which best represents a mutualistic relationship?

• A lion lies in the tall grass watching a herd of gazelles.

• Maggots feed on the decaying remains of a dead animal.

• Insects pollinate a flower while feeding on nectar in the flower.

• A tapeworm takes in digested nutrients in the intestines of a sheep.

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NGSS.MS-LS2-2

Which best represents competition among species in an ecosystem?

• A bear gathering berries.

• A hawk hunting field mice.

• A wolf marking trees in territory.

• A ladybug eating aphids found on plants.

Birds are often seen with cattle in a pasture. The feeding cattle stir up insects and the birds eat the insects. How would this relationship be described?

• The birds have a negative effect on the cattle, and the cattle have a positive effect on the birds.

• The birds have a postivie effect on the cattle, and the cattle have a positive effect on the birds.

• The cattle have a positive effect on the birds, and the cattle are unaffected.

• The cattle have a negative effect on the birds, and the cattle are unaffected.

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NGSS.MS-LS2-3

In the arctic, polar bears hunts seals as as source of food. In this relationship,

• polar bears are consumers; seals are producers.

• polar bears are producers; seals are consumers.

• polar bears are predators; seals are prey.

• polar bears are prey; seals are predators.

Barnacles attach to the sea turtles and whales and filter the water as they swim. What type of relationship is this?

• Predator-Prey

• Mutualism

• Parasitism

• Commensalism

Which term best describes two predators living in the same habitat who feed on the same prey?

• Coexistence

• Competition

• Mutualism

• Commensalism