Why do chipmunks in the Great Smoky Mountains survive? Their needs are met in that environment They have driven out all the other chipmunks Humans feed them, which helps them survive Humans have moved them from cities to the mountains

Which describes a balanced ecosystem? There is enough food for people to exist One type of animal and plant depend on each other The food supply, living space, and shelter for animals and plants is plentiful Humans create shelter and food for animals and plants

A meadow has too many rabbits. What would help balance this ecosystem? More rain that grass needs More foxes that eat rabbits Fewer foxes that eat rabbits More grass for rabbits to eat

How do these organisms interactions help balance their ecosystems? Rabbits make homes in grass Grass and rabbits both need oxygen Grass makes oxygen, and animals use it 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? The foxes would find new prey The number of foxes would increase The number of foxes would decrease The foxes and rabbits would compete for food

What impact does a parasite have in an ecosystem? Helps the entire ecosystem Hurts one organism and helps another Helps both the host organism and parasite Hurts both the host organism and parasite

Which would cause an ecosystem to change quickly? An earthquake A lake drying up A climate change A lake becoming a marsh

What might be the effect on an ecosystem of a climate change from rainy to dry? No change A change from plants to animals A change from a forest to marsh A change in kinds of plants and animals

What could scientists tell from a fish fossil found in a desert? That fish is now extinct Fish once had legs to travel Fish once lived in dry places The desert was once a sea or lake

What might be a reason an animal becomes extinct? It is a predator It produces oxygen Its habitat is destroyed It adapts to its environment

How are a hawk and an owl able to succeed, even though they compete for food? The hawk eats the owl The owl changes its diet One animal moves to a different habitat One hunts at night, and the other hunts during daytime

What is one way people can disturb the balance of ecosystems? Breathing air Planting trees Riding bicycles Building houses

How can damage from strip mines be repaired? Erosion can fill the hole Mining companies can replace the soil Rain can wash the rock away into rivers Mining companies can go mine in another place

Why did the United States establish national parks? To make money for the national government To provide Americans with great vacation spots To preserve nature’s beauty and habitats of plants and animals To give Americans a chance to see things they’ve never seen before