I would say D. natrural selection
During mitosis, the chromosome copies separate the nucleus divides and the cell divides. This produces identical two cells called daughter cells. The main purpose of mitosis is for growth and to replace worn out cells.
Answer:3.5 billion years ago
Explanation:About 3.5 billion years ago, the first microscopic organisms appeared in the ocean. The first invertebrates developed in the oceans. They were soft-bodied animals with a shell or carapace, such as these trilobites.
