Which best describes the geologic time scale? a. it explains why events happen throughout earth’s history. b. it presents the correct sequence of events in earth’s history. c. it is used to determine the absolute dates in years for different periods. d. it was created by scientists who studied index fossils and climate change.

The correct answer is option B, that is, it presents the correct sequence of events in Earth’s history.

The geological time scale signifies towards a framework of chronological dating that relates geological strata with time. It is used by geologists, paleontologists, and other scientists of the Earth to illustrate the relations and timings of incidents that have taken place during Earth's history.  

Option (B)

Explanation:

A geological time scale is the sequence of events that have taken place in the past since the formation of the earth. These events have formed due to the various geological process that has undergone in the past and are grouped in different zones. These show how the landscape formed and when the organisms started to appear and how the evolutionary process has taken place.

These events are grouped into three eons namely,  

1) Hadean  

2) Archaean  

3) Proterozoic

4) Phanerozoic- It is again divided into three parts. They are-

        (a) Paleozoic

        (b) Mesozoic

        (c) Cenozoic

These geological time scales play an important role in understanding the existence of different phases on earth and also it helps in identifying which age a rock belongs. It is very frequently used by geologists to determine the past activities.

Thus, the correct answer is Option (B).

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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cell division is not regulated in tumor cells.