Answer:
It was the sudden appearance (over a 10my period) of many different organisms, which occurred approx 540-548 mya. ... So it can be away from sources of oxygen, preventing microorganisms from decomposing the organism.
Answer:
Hunting
Explanation:
You may see a mountain lion hunting an elk in their ecosystem, which is apart of the circle of life.
I believe its two and four
Cells<span> are the basic unit of structure and function in all living things. Hope this helps. :)</span>
