Some plants do not grow naturally in an area. How can these plants endanger the plants that do grow naturally there?

Why are the effects of a beaver's dam good for some animals but not good for others?

Which statement about carbon dioxide levels in the atmosphere refers to global warming?

How can the removal of trees lead to an increased amount of soil washed into the oceans?

What is the main effect of the removal of trees on animals that live in a forest?

Which is a major cause of air pollution?

Which is a characteristic of a tropical rainforest?

All of the following are vertebrates except

Which ecosystem is changed when a beaver builds a dam?

All of the following are characteristics of a tundra except

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