What is a chemical element? a collection of bonded atoms

an element only needed in small amounts by the body

a pure chemical substance made of one type of atom

a molecule made of different types of atoms

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

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Suppose you are facilitating an advisory group to address teen pregnancy. whom would you invite to the group and why ? .