The Differences in the Respiratory Systems<span> of </span>Frogs<span> & </span>Humans<span>. </span>Frogs<span> and </span>humans <span>need to breathe for the same reason: to bring oxygen into the body and to expel carbon dioxide. We both have lungs for these tasks, but that's where most of the similarities end.</span>
C, it is the powerhouse of a cell
Answer:
so they can fly obviously
They ensured that balance in the ecosystem was maintained. They ensure that the genetic diversity and species is maintained. Sea otters applied natural selection pressures on the sea urchins population hence maintaining their level such that they will not overgraze on the kelps. Overgrazing would severely affect the sea urchin population and consequently severely affect the sea otters population too.