What do scientists use to divide the geologic time scale? major divisions in the fossil records major divisions in the sedimentary rock layers evidence for catastrophic events in earth's history major changes in mineral deposits in the rock layers

Ans.

The geological time scale (GTS) is defined as a system of chronological dating, used to relate geological strata to time. Scientists use major events, such as catastrophic events in the history of the earth to divide the GTS.

For example, the partition between Permian and Triassic periods is denoted by a global extinction that led to elimination of many plants and animals of the earth.

Thus, the correct answer is option). 'evidence for catastrophic events in Earth's history.'

major divisions in fossil records

Explanation:

this is correct I promise look at the pic below

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme