1.if the same index fossils are found in different rock starta miles apart, what is probably true about the rock layers? 2. what is the longest geologic time period?a shister out. im desperate

1) The rocks are probably the same age.

If two rocks both contain the same type of index fossil, their age is probably very similar.

2) Eon

Definition of Eon: An immeasurably or indefinitely long period of time

The answer would be "Cyclins are proteins that regulate when and how often a cell divides". Cyclins belong to a family of proteins that control the progression of a cell through its respective cell cycle. This is initiated by activating cyclin-dependent kinase (CDK) enzymes which regulate transcription of RNA and process mRNA during mitosis.