Scientists used major changes in life forms in the fossil record to form the geologic time scale

The correct answer is;

True

Explanation:

Fossils are fundamental to the geologic time scale. ... Rocks formed through the Phanerozoic Eon may have fossils of complicated animals and plants such as dinosaurs, mammals, and trees. We study Earth's history by studying the record of past experiences that are stored in the rocks. The geologic time scale (GTS) is a system of chronological dating that describes geological strata (stratigraphy) to time. It is used by geologists, paleontologists, and other Earth scientists to explain the timing and connections of events that have occurred during Earth's history.

the answer is a) cell division.

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the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.