Life Science Review

This diagram shows a simple ocean food chain.

algae → fish → seal

Which will most likely occur if the fish population decreases?

• The algae and seal populations will increase.

• The algae and seal populations will decrease.

• The algae population will increase, and the seal population will increase.

• The algae population will increase, and the seal population will decrease.

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This food chain shows organisms in a classroom aquarium. Which would benefit if the snail living in the aquarium were removed?

• algae

• crayfish

• fish

• plant

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Why are animals like deer, raccoons, bears, and coyotes sometimes seen in neighborhoods?

• because it is easier to find food

• because they can escape predators

• because their habitats are increasing

• because their habitats are decreasing

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Which is an example of a terrestrial organism relying on an aquatic organism for food?

• Eagles consume fish to survive.

• Birds consume worms to survive.

• Fish consume seaweed to survive.

• Frogs consume flying bugs to survive.

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Which two ecosystems provide most of the food for the world’s population?

• ponds and lakes

• estuaries and forests

• grasslands and oceans

• salt marshes and deserts

How are a grassland ecosystem and a pond ecosystem connected?

• Grassland animals, such as fish and snails, may live in a freshwater pond.

• Grassland animals, such as buffalo and rabbits, may drink salt water from a pond.

• Pond animals, such as buffalo and rabbits, may drink freshwater from the grassland.

• Grassland animals, such as buffalo and rabbits, may drink freshwater from a pond.

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Which list of organisms could be found living in an ocean and an estuary ecosystem?

• ducks, deer, and reptiles

• jellyfish, crabs, and dolphin

• black bear, deer, and insects

• insects, reptiles, and prairie dogs

Which is a main difference between a grassland and forest ecosystem?

• the amount of trees, as forests have more

• the amount of trees, as grasslands have more

• their location, as only forests are found in North America

• their location, as only grasslands are found in North America

Which correctly compares lakes and ponds?

• Ponds are usually larger and deeper than lakes.

• Lakes are usually larger and deeper than ponds.

• Ponds usually contain salt water, while lakes contain freshwater.

• Lakes usually have the same temperature from top to bottom, while ponds do not.

In which ecosystem can you find a mix of salt water and freshwater?

• estuaries

• lakes

• oceans

• ponds