What is the main source of energy that causes water to evaporate from the surface of Earth?
A: sun

Chromosome mutations involve the deletion or duplication of many genes. The effects of chromosome mutations are often much greater than mutations within a single gene, because chromosome mutations
A: can cause abnormal development of the offspring.

Who was a leading authority on continental drift in the early 1900s?
A: Alfred Wegener

In some national parks, controlled fires are maintained by firefighters. Which of these is one of the major reasons for using controlled burns to maintain certain ecosystems?
A:
to rid the forest floor of accumulated deadwood and brush