Read about Africa's two greatest environmental concerns: desertification and the spread of disease. Choose one of these concerns and write a short paragraph about its impact on Africa. What has caused this problem to occur, and how has it impacted people who live there?

What are the similarities and differences in the way geologists and biologists approximate the age of the earth? justify your response in two or more complete sentences.

Which age groups shows the graestest diferrence between males and females

Impressions of tropical swamp plants were observed on rocks in polar regions. the impressions were dark black imprints, which means the fossils are examples of ( 1 ) the fossils tell us that polar regions ( 2 ) ( 1 ) a. carbonization b. mineralization c. trace fossils ( 2 ) a. had tropical plants that can grow in ice b. might have had a diffierent climate in the past c. will have abundent vegitation