For many years, whole or fragmented hominid skulls have been excavated.
Some of these skulls date from as early as 6 million years ago. By
comparing these skulls with other archeological findings, scientists are
able to determine when major accomplishments were successfully
achieved. Which of the following statements correctly states the
evolutionary progression of hominids?
Hominids first developed tools, then language. The brain got smaller.
Hominids first developed language, then tools. Brain size decreased.
Hominids first developed tools, then language. The brain increased in
size.
Hominids first developed language, then tools for farming. The size of
the brain increased.

Statement that correctly states the  evolutionary progression of hominids is that hominids first developed tools, then language and the brain increased in  size.

Explanation:

The evolution of hominids occurred over a long period of time and included several steps in order for evolution to reach the Homo sapiens which is now known.

For this reason, the statement which best describes the evolution of hominids is that hominids first developed tools, then language and the brain increased in  size.

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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