The geologic time scale is based on

Your answer would be, The Geologic Time Scale is based on, Divides the history of Earth is divided into Eons, Eras, Periods, and Epochs; Also, the outlined of the Earth, and the development of Earth, and the life on Earth.

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The answer is: It is based on representing the events of the History of the Earth and of life ordered chronologically.

Explanation:

The geological time scale is the frame of reference to represent the events of the History of the Earth and of life arranged chronologically.

It establishes divisions and subdivisions of the rocks according to their relative age and the absolute time elapsed since the formation of the Earth until today.

The answer is: It is based on representing the events of the History of the Earth and of life ordered chronologically.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.