What structural feature allows lipids to insulate and waterproof an organism

i do not know and i have a 100 in this class

the answer is c.) there is a warm front in region a and a stationary front in region b.

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.