Which of the following is correct? a. when the heart expands, it fills with air from the atmosphere. b. when the lungs contract, they fill with air from the atmosphere. c. when the lungs expand, they fill with air from the atmosphere. d. when the heart contracts, it fills with air from the atmosphere.

Which term defines one's age as measured by how well the body is working? chronological age biological age social age mental age

Make a prediction about that person’s wellness and justify your prediction using two or more complete sentences.

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