What organisms are you talking about
The answer is energy, I think
<span>This rate tends to be faster than in most other periods. The rates in previous eras was very gradual and did not have as much of a deleterious effect on the life that was present: today's rate is much more rapid and has the potential to do much more damage to the life on the planet.</span>
A. At the end of meiosis I each cell has twice the number of chromosomes as was in the original cell.
