Speciation occurs when 1. a new species mate with the old species.
2. a new species formed from existing populations.
3.All answers are correct.
4. a new organism was formed from nowhere.

Most of the carbon on earth is stored in the form of

Cathy hypothesized that corn would not grow in mud. to test this hypothesis, she took corn kernels and placed 5 in mud, 3 in soil, and 2 in water. to her surprise, the kernels in the mud grew faster than the kernels in the soil. what error might have caused these unexpected results? a. wrong hypothesis b. not enough variables c. undefined control d. too many variables

What is the next step in the process after a substrate enters the active site of an enzyme