Why do chipmunks in the Great Smoky Mountains survive?

a. Their needs are met in that environmentb. They have driven out all the other chipmunksc. Humans feed them, which helps them

survived. Humans have moved them from cities to the

mountains

Which describes a balanced ecosystem?

a. There is enough food for people to existb. One type of animal and plant depend on

each otherc. The food supply, living space, and shelter for

animals and plants is plentifuld. Humans create shelter and food for animals

and plants

A meadow has too many rabbits.What would help balance

this ecosystem?

a. More rain that grass needsb. More foxes that eat rabbitsc. Fewer foxes that eat rabbitsd. More grass for rabbits to eat

How do these organisms interactions help

balance their ecosystems?

a. Rabbits make homes in grassb. Grass and rabbits both need oxygenc. Grass makes oxygen, and animals use itd. Grass depends on rabbits to protect it

How would an ecosystem change if the rabbits that were the main prey for

foxes became sick and died?

a. The foxes would find new preyb. The number of foxes would increasec. The number of foxes would decreased. The foxes and rabbits would compete for

food

What impact does a parasite have in an ecosystem?

a. Helps the entire ecosystemb. Hurts one organism and helps anotherc. Helps both the host organism and parasited. Hurts both the host organism and parasite

Which would cause an ecosystem to change quickly?

a. An earthquakeb. A lake drying upc. A climate changed. A lake becoming a marsh

What might be the effect on an ecosystem of a climate change from

rainy to dry?

a. No changeb. A change from plants to animalsc. A change from a forest to marshd. A change in kinds of plants and animals

What could scientists tell from a fish fossil found in a desert?

a. That fish is now extinctb. Fish once had legs to travelc. Fish once lived in dry placesd. The desert was once a sea or lake

What might be a reason an animal becomes extinct?

a. It is a predatorb. It produces oxygenc. Its habitat is destroyedd. It adapts to its environment

How are a hawk and an owl able to succeed, even though they

compete for food?

a. The hawk eats the owlb. The owl changes its dietc. One animal moves to a different habitatd. One hunts at night, and the other hunts

during daytime

What is one way people can disturb the balance of ecosystems?

a. Breathing airb. Planting treesc. Riding bicyclesd. Building houses

How can damage from strip mines be repaired?

a. Erosion can fill the holeb. Mining companies can replace the soilc. Rain can wash the rock away into riversd. Mining companies can go mine in

another place

Why did the United States establish national parks?

a. To make money for the national governmentb. To provide Americans with great vacation

spotsc. To preserve nature’s beauty and habitats of

plants and animalsd. To give Americans a chance to see things

they’ve never seen before