Answer:
Mutualism
Explanation:
both humans and plants benefit from it because we breath out carbon dioxide
Topsoil is the most fertile soil layer for plants.
<span>The best definition of a population is </span><span>D. The total number of individuals in a given area. Keyword "Individual." and "Total number".</span>
Answer:
complement is a system of plasma protiens that can be activated directly by pathogens
Bones teeth and maybe scull