Diffusion allows the exchange of substances; the entry of oxygen, proteins, etc into the cell and the removal of waste substances.
Wolves are causing a trophic cascade of ecological change, including helping to increase beaver populations and bring back aspen, and vegetation.beavers.
Answer:
volcanic eruption and solar variation
mark as brainliest
Answer: The blood enters the left atrium, through the mitral valve then into the left ventricle
Explanation:
<span>Most ecological process cannot be observed or studied at the individual level.</span>
