When does crossing over occur?

a) meiosis

b) mitosis

c) both

d) neither

Which best summarizes the concept of natural selection? A. an organism will always adapt to its environment B. a mutation always makes a species fitter C. the fittest organisms survive and reproduce D. an organism will always mutate to survive

In dry seasons, some wells go dry because the drop in

Which statement best explains how the effect on a particular allele can change the genetic makeup of a population over time?

Which of the following statements about enzymes is/are true? a. The more heat that is added to a reaction, the faster the enzymes will function. b. Enzymes speed up the rate of the reaction without changing the DG for the reaction. c.

Many fault lines are obvious at the surface. How can the epicenter of an earthquake be located miles away from the fault line?

How are nuclear tests performed without contaminating the atmosphere?

Example of a decomposer and explain what would happen if decomposers were absent from a forest ecosystem

Coal, oil, and natural gas

Which factor that contributes to cancer increases with exposure to the sun? radiation asbestos tobacco genetics

What was the purpose of the Land Ordinance of 1785?