What can a negative consequence of humans being hunter-gatherers? A. they needed to stay in one location for food

B. Nate cultivated their own food

C. they had to move around to find food

D. they had to have large families to help on the farm​

"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.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products