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.

How does a parent use active listening when communicating with a child

Which two levels of the spine that can undergo flexion and extension?

Group of genes that encode molecules found in all body cells, creating a biochemical “fingerprint” that serves as the “id” for cells so that they are marked as “self” a) deoxyribonucleic acid (dna) b) entry inhibitors c) major histocompatibility complex (mhc) d) non-nucleoside reverse transcription inhibitors (nnrtis)