Answer:
Beavers and their dams play an important role in nature. Because of the dramatic effects their dams have on surrounding ecosystems, these mammals are considered a keystone species. By constructing dams they create wetlands -- lush environments which attract fish, ducks, frogs and other creatures.
Explanation:
Burning, cooking, rusting, and rotting are examples of chemical changes. 2
The answer is either b or d
Answer:
The cytoplasm holds everything together in the cell. Without it, the organelles would not be able to stay in place.
Explanation: