Pepsin is a digestive enzyme produced by the stomach. It breaks down the proteins you eat into amino acid monomers. Pepsin works best in an acidic environment. The pH of stomach contents is usually around 2 due to the high concentration of hydrochloric acid produced by the lining of the stomach. (Compare this to the pH of your mouth's saliva, which is around 7.) Enzymes are like most other proteins, with one exception. What distinguishes enzymes from other proteins

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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hi, natural selection of the peppered moth during the industrial revolution in 19th-century england is an example of an outlier in the study of evolution. during this time, pollution from factories filled the forests, coating trees in a layer of soot—turning white trees black

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they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

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that is true   : ) hope this you