D. scientists can easily tell which variable caused the results.
Good luck!
Answer: this is a tougher one but I would say just do your best ;)
Explanation:
:(
Habitat-the natural home or environment of an animal plant or organism.
Biosphere-the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms.
I believe that try both provide somewhere for animals to reside.
Hopes this helps
A disease that is not contagious.
Answer:
B but i might be wrong i dont think its A or D though
