Put the following organisms in an aquatic food chain in the order in which energy flows through them, explaining the reason for their placement.

small fish, mammal, phytoplankton, zooplankton.

Phytoplankton, Zooplankton, Small fish, Mammal

Explanation:

A food chain is a linear chain where organisms eat and being eaten by one another. The food chain shows the energy transfer of different organisms i.e. from producers to higher order consumers. In aquatic food chain phytoplanktons are the producers and eaten by Zooplanktons. Zooplanktons are free living aquatic animals which consume energy from phytoplanktons. Then the smaller fishes takes the place of secondary consumers which feed on zooplankton. Finally the tertiary and quaternary consumers. Here mammal are whales which may be tertiary or quaternary consumer. In this way all organisms get energy from one another.

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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