Answer:
What sends oxygenated blood back to the heart from the lungs?
Oxygen-rich blood flows from the lungs back into the left atrium (LA), or the left upper chamber of the heart, through four pulmonary veins. Oxygen-rich blood then flows through the mitral valve (MV) into the left ventricle (LV), or the left lower chamber.
Explanation:
Answer: a trillion cells
Explanation:
Cells are the basic building blocks of living things. The human body is composed of trillions of cells, all with their own specialised function. Cells are the basic structures of all living organisms
Answer:
Analog signal ..............
A all particlea stop moving then there will be no movement so it will be absolute 0
Answer:
carbon dioxide
Explanation:
Hope this helps! :)
because with to much of it in the atmosphere it would become harder for us to breath and the affects of oxygen deficiency are bad.
