Together organ systems make us healthy and living.
Answer:
A niche is a way that a population uses the living and nonliving resources of its habitat.
Explanation:
A niche is the role a population has in it's habitat, and the second option is the best one that matches.
Hunter-gatherer societies are often nomadic. I believe.
Answer:
100000
Explanation:
multiply the length value by 1e+6