The theory would be endosymbiont theory. It was developed on the idea that some eukaryotic organelles come from prokaryotic organisms. It is also known as symbiogenesis. This theory says that these organelles were first from prokaryotic cells that is living inside a host cell.
Answer:
chromosomes will be seen in the nucleus of the dividing cell because they are visible when a cell is dividing apposed to non-dividing cells.
Explanation:
The sequence of amino acids in a protein is determined by DNA. In a protein that is present in all species, the amino acid sequence will be different. Once a protein has been chosen, the amino acid sequence of that protein in different species are compared. More similarities, or fewer differences, indicate that two species are closely related. (sorry if im wrong!)
When a whale dies it sinks to the ocean floor, and it's carcass is known as whale-fall. As the whale's carcass lies on the ocean floor, it's organic fragments enrich the sediment.
I hope this helped :D
