This climate is always dry. Usually we think of these places being hot, but sometimes they are cold! A temperate
B desert
C tropical
D equatorial

Which of the following examples can cause gene flow between populations? a. an increase in predators to a population of zebra b. a volcanic eruption that kills half of a population of mice c. bird droppings that contain seeds from a different location d. a person that sprays a toxin on a group of mosquitoes

Why are human population trends difficult to predict?

How can scientists use the fossil record to find evidence of relationships between different species?