Water is referred to as a polar molecule.

Describe the characteristics of a polar molecule.

Characteristics of polar molecule

- they should have opposite charge

- they should have same dipole moment value

- they should have electronegativity different

Explanation:

Polar molecule is characterized by an uneven distribution of the electrons that form the covalent bonds between each atoms in the molecule

Polar molecules has a net dipole as a result of opposing charges from polar bonds, since water has slightly positively charged side and a slightly negatively charged side. This makes it a polar molecule

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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it would lead to upper respiratory infections and pneumonia.