Carlos is collecting data about the length of earthworms in his backyard. the shortest worm he found is 4 inches long; the longest worm is 8 inches long. if most of the worms are either short or long, which type of distribution is displayed in the population?

a. directional
b. disruptive
c. stabilizing
d. normal

The correct answer is- B. disruptive

Explanation:

Disruptive selection or diversifying selection is the type of selection in which individuals who have extreme traits are selected over the individuals who are having the intermediate traits.

For example, dark and light-colored oysters have advantages of camouflage over medium colored oysters because white-colored oysters camouflage behind white stones and dark colors in shadows but medium color oyster have the limited region to camouflage from predators, therefore, their numbers are very low than the two extreme relatives.

So here also most of the worms are either short or long which shows that disruptive distribution is displayed in the population.

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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