The right answer is vein (it contains blood and has valves).
The infra-cardiac veins of small and medium caliber possess this system of fight against gravity. The valves consist of a dense connective tissue, surmounted by endothelial cells, corresponding to a fold of the intima. They allow blood circulation in the sense organ / heart but prevent venous reflux.
The correct answer is C A single-celled protist divides into two cells, and each one becomes another protist.
Explanation:
Phytoanticipins are defined as defense compounds which are constitutively present, i.e., regardless of the presence of pests or diseases.
Answer:
the powerhouse of the cell
Explanation:
Answer:
it is important to view cells under a microscope because cells can change?
False
Explanation:
Cell does not change when viewing under microscope, it is expedient to view under microscope because it is a microorganism that can not be seen with naked rather than with a microscope
