HELP ASAP ILL GIVE BRAINLIEST What does the principle of faunal succession state?

Fossils are deposited in approximately horizontal layers and spread out until they reach a barrier.

Absolute dating is required to determine the relative age of animals based on their fossils.

Specific groups of organisms have followed one another in a definite sequence through the Earth's history.

Rock layers with the same unique grouping of fossils are of the same geologic age.

Specific groups of organisms have followed one another in a definite sequence through the Earth's history.

Explanation:

The principle of faunal succession, also known as the law of faunal succession, is based on the observation that sedimentary rock strata contain fossilized flora and fauna, and that these fossils succeed each other vertically in a specific, reliable order that can be identified over wide horizontal distances.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

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