What is the purpose of "Crossing Over" which occurs during Prophase 1 in meiosis? A: Increase genetic diversity in a species

B:Break down the nuclear membrane

C:Form the spindle fibers

D:Replicate DNA

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere