B.
Humans are also part of ecosystems and if they cease to exist, human well being will be affected.
I filled out a few boxes for you to start you off. I also gave you a direct research sources for some animals that will take you to the necessary information.
This is what I have so far as examples for you. Again, I said I wouldn't do all of your work for you, however, I will help you through your research and graph.
Epithelial tissues are the tissues that lines inside of hollow organs. <span> Epithelial tissues covers body surfaces; lines the body cavities and hollow organs.</span>
ANSWER:
Dark coloured fish living in lake B while bright colored fish living in lake A, each group of fush have same gene fool where random mating is possible and chances of speciation is null. However, when migration of one group of fish occur toward another group of fish then gene flow also occured. This result into breeding amongst members of two different groups. So the chances for speciation increase, and it is possible that with the passage of time new species may develop.