The answer is false because people can cause changes to the ecosystem by doing a lot of things like cutting down trees Etc.
50% of a person's daily iron requirement per serving.
Answer:
CDC is the correct organization .
I would say the hypothalamus. But if your talking about alertness that would be the recticular formation. Its a bunch of nerves in the brain connecting the spinal cord cerebrum and cerebellum and it's what keeps us conscious and alert.
