Water evaporates and falls back to Earth as rain or snow. What is the primary energy source that drives this cycle?

• The wind

• The sun

• Air Pressure

• Ocean currents

The following question refers to the diagram above, showing a food web. The arrows show the direction of energy flow. Each arrow points from the organism that is consumed to the organism that consumes it.

Which statement best explains why decomposers are an important part of this food web?

• They use sunlight to make their own food.

• They give off oxygen for animals to breathe.

• They provide camouflage for small animals.

• They make nutrients available to plants.

The following question refers to the diagram, which represents a portion of Earth's water cycle. Which process is represented by 2?

• Liquid water evaportating

• Cool air warming as it rises

• Clouds blocking the Sun's energy

• Water vapor condensing

Which living things in the pond system break down dead plants and animals?

• Green algae

• Bacteria

• Rushes

• Frogs

Which group of organisms would all be found living in a tropical rain forest?

• Lizards, insects, cacti, kangaroos

• Vines, palm trees, tree frogs, monkeys

• Evergreens, moose, weasels, mink

• Lickens, mosses, caribou, polar bears

Herbivores and carnivores have in common that they both

• are scavengers

• are consumers

• are producers

• are omnivores

The environment in which an organism lives is called a

• ecozone.

• habitat.

• climate.

• niche.

A food chain is shown above.

Which organism will have the most energy available?

• plant

• mouse

• snake

• hawk

This biome has some of the most rich soil in the world.

• taiga

• tundra

• grassland

• desert

An organism that survives by living on or in another animal and feeding on that animal is called a/an

• arachnid.

• parasite.

• earthworm.

• cnidarian.