Index fossils are found throughout the world and come from organisms which existed during limited periods of geologic time. Which of the following best describes what index fossils can be used to determine? A.
the age of a layer of rock
B.
the way an organism went extinct
C.
when an organism first appeared on Earth
D.
how an organism evolved over time

The index fossils can be used to determine the age of a layer of rock and how an organism evolved over time

Fossils gives geologist some information about the organism that lived in the past because when those organism dies, they decay and goes deep into the lithosphere.

Index fossils refers to those fossils used by geologists to determine the relative age of rock strata or other fossils with ease.

The index fossils can be used to determine:

Hence, the Option A and C is correct.

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the quote by walter cronkite contributes to the central idea of the text by supporting the central idea. cronkite argues that what is deemed “right” for and in america may not be good for other countries. this supports the central idea of the text, that the vietnam war was unpopular in america for multiple reasons- including cronkite’s.