Which list of words describes an action potential? a. all or none, neurotransmitters, membrane potential
b. membrane potential, neurotransmitters, electrical signals
c. electrical signals, all or none, neurotransmitters
d. all or none, membrane potential, electrical signals

6. in the dna double helix, how are the two strands of dna held together? a. chemical bonds between base pairs hold the two strands of dna together. b. hydrogen bonds between the base pairs hold the two strands of dna together. c. hydrogen bonds between sugar groups and phosphate groups hold the two strands of dna together. d. chemical bonds between sugar groups and phosphate groups hold the two strands of dna together.

Modern whales developed their traits through natural selection what occurs during the process of natural selection

Select the correct answer from each drop-down menu. in an experiment, dr. travis examined the effects of calcium intake on osteoporosis, a condition that causes an increased risk of bone fractures. the amount of calcium is variable. the risk of bone fractures .