<span>Phosphorous cycle. </span> It differs from the other major biogeochemical cycles in that it does not include a gas phase
A closed system is a system that makes no physical or chemical exchanges with its environment. Of these systems provided as choices (tree, human, clock, car), only a clock does not make exchanges with the environment, except for energy.
Therefore, of that list, only a clock would be a closed system.
Hope that helped! =)
Answer:
Specie
Explanation:
They are a group that interbreed with each other, only, since they cannot produce fertile offspring with those of another species.
I think it's hydrothermal vents? hope its right because I have short term memory loss.
Answer:
the warm water and abundant sunlight in the nertic zone limits the plankton population