Select all that apply.
carbohydrates
in the body are primarily fats
are primarily sugars and starches
are the most readily available source of energy for organisms
are the largest of the four main biological macromolecules

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.