The B vitamins act as parts of: a. anticoagulants b. coenzymes c. antibodies d. the bone matrix e. intrinsic factors

true, i don't really know what you're asking but from the info you provided im guessing the answer is true.

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.

yes, because even though a theory has a  lot of evidence to support it, it is not always true

answer///(c) the maximum number of organisms an environment can support for a long time; i believe this is correct, plz check luck;