I think burgess shells would be the answer
The answer is A. cleavage, differentiation, fertilization, gastralution
Answer:
The genetic material in the sperm combines with the genetic material in the egg to create a new cell that starts dividing rapidly. You're not actually pregnant until that bundle of new cells, known as the embryo, travels the rest of the way down the fallopian tube and attaches itself to the wall of your uterus.
Explanation:
They hide in places like driftwood and vegetation