6.
what do you know about a chemical compound by looking at its chemical formula?
the number and kinds of atoms in the compound
the properties of the molecules in the compound
o how the compound reacts with other compounds
how many molecules are in a sample

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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he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

the answer is 95 degrees