Answer:
Homeland Security Presidential Directives help in food emergencies
Explanation:
Answer:
The main job of red blood cells, or erythrocytes, is to carry oxygen from the lungs to the body tissues and carbon dioxide as a waste product, away from the tissues and back to the lungs. Hemoglobin (Hgb) is an important protein in the red blood cells that carries oxygen from the lungs to all parts of our body.
Explanation:
<em>I think it is right...</em>
<em>Please make me brainliest</em>
The primary difficulty is the fact that we do not know all of the organisms that currently exist in the world along with those that existed in the past.
Assuming this is multiple choice, the answer would be "niche". An organism's niche is where that certain organism fits into an ecosystem, or what their part to play is.
