What would be the best microscope to view living single-celled organisms in a sample of pond water?

ability to mate mark me brainliest

"a.) well–developed vascular system."

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.