A team of scientists discovers a fossil of an ancient plant species. They report that the plant developed from an embryo and had vascular tissues, but it did not have seeds. The ancient plant might have been an ancestor of which set of plants? a. mosses only
b. ferns only
c. mosses or ferns only
d. ferns, cone-bearing plants, or flowering plants

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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the dna of humans and mice is almost 92% similar. this similarity indicates that . mice have a tail, while humans have a tailbone. the tailbone is a structure in humans.yes it's true.