Which of the following is an example of moving properly for a push-up
a. raising and lowering the body to 90° angle at the elbow with a flat back
b. raising and lowering the body to greater than 90° angle at the elbow is a flat back
c. raising and lowering the body to less than a 90° angle at the elbow with a flat back
d. raising and lowering the body with elbows locked out in the up position and a flat back

Melanocytes and keratinocytes work together in protecting the skin from uv damage when keratinocytes a. provide the melanocyte with a protective shield against abrasion b. maintain the appropriate temperature so the product of the melanocyte will not denature c. maintain the appropriate ph in order for the melanocyte to synthesize melanin granules d. accumulate the melanin granules on their superficial portion, forming a uv-blocking pigment layer