Which of the following macromolecules are polymers? a lipids b carbohydrates c nucleic acids d proteins e all the choices are polymers

individual oxygen atoms are formed during photosynthesis.-c.

b. the carbon cycle ensures living things have a source of hydrogen

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.