Answer:
Explanation:
It is estimated that the Precambrian Era lasted between 3.9 and 4 billion years. Many scientists believe that this era accounts for 90 percent of the world's history.
<span>a. chromosomes hope that helped I'm doing the same quiz.</span>
Once the sperm cells are formed, the are stored in the epididymis, where they are temporarily stored while they mature.
Hope this helps :)
Every species exhibits variations based on various genes being activated at various times. An example with humans can be eye color or hair color. What species means is that all members of a species can procreate with healthy, capable of procreating progeny, but anything else is just a variation.
