Compressibility a) how easily a substance can be set on fire flammability b) measure of how much the volume of matter can decrease under pressure heat of combustion c) the readiness of a substance to undergo a chemical change reactivity d) measure of how much heat is given off when a substance is burned

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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they fuse to form they have half as many chromosomes as a somatic cell of the same individual. b