There are two main sources of energy in the rock cycle. One source is external to Earth, and one is internal to Earth. Write a brief paragraph that identifies these sources of energy, and give an example of how each source of energy causes rock to change form. ​

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.

layer 3 is younger than layer 6.

d. organisms have cells with different shapes and functions.