How do individual cells maintain homeostasis

Apart of an ecosystem that can restrict the growth of a population is referred to as

Which of the following shows the correct order in which light information travels through the eye? (2 points) lens, pupil, retina, optic nerve pupil, lens, retina, optic nerve pupil, lens, optic nerve, retina lens, pupil, optic nerve, retina

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?