Which example is one specific form of simple diffusion? if water moves into a cell by osmosis, it is moving into an area of higher water concentration. if water moves into a cell by diffusion, it is moving into an area of higher solute concentration. if water moves into a cell by osmosis, it is moving into an area of higher solute concentration. if water moves into a cell by diffusion, it is moving from an area of higher concentration to an area of lower concentration.

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.

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 supermassive black hole is in the middle of the galaxy.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds