Which of the following shows fossils as evidence of continental drift?

a. limestone layers in the appalachian mountains of north america were exactly the same as the limestone in scotland's highlands
b. mesosaursus, an ancient reptile, had been discovered in south america and africa.
c. glacial deposits and rock surfaces scoured and polished by glaciers are found in south america, india, africa, and australia.
d. one type of rock found in brazil matched a rock found in western africa

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.

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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