Which list of words describes an action potential? all or none, neurotransmitters, membrane potential
membrane potential, neurotransmitters, electrical signals
electrical signals, all or none, neurotransmitters
all or none, membrane potential, electrical signals

Which of these serves as a reference for comparison during a scientific investigation? a)outcome variable (dependent variable) b) test variable (independent variable) c)control group d)hypothesis

Which is an example of a population?

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.