Sickle cell disease likely arose as a mutation that was passed along because it protected individuals from

Describe one piece of evidence that supports the the idea that the present-day continents were once part of the larger ancient continent Pangea that's split apart

Explain why the region around the equator is relatively rainy?

A molecule that can be used as a molecular clock has a neutral mutation rate of one mutation per 20 million years.

The rna molecule is made up of how many strands? 1 2 3 6 12

When nutrients are transported from intestinal epithelial cells to the vascular system, what organ is first to receive them?

Elements are composed of atoms of at least two different types. a. True b. False

The flat area surrounding the mouth of the Mississippi River is covered with rich sediments important to farming in this area. These sediments are deposited at a rate of 80,000 tons per year.

What place are sloths found?

In a solution of salt and water, which component is the solute? a. salt b. water c. beaker d. oxygen c

What are the two types of warm air masses that influence the weather in north america name and explain how they typically affect the weather