Define relative dating science

In this sentence we understand that there are many dogs in the world, but we are only talking about the ones that like cats.

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You can usually tell when a relative pronoun is the object of the clause because it is followed by another subject verb.

See below, in the first sentence the relative pronoun cannot be ommitted because it is the subject of the relative clause ("the woman spoke").

Commas are not used to separate defining relative clauses from the rest of the sentence.

Commas or parentheses are used to separate non-defining relative clauses from the rest of the sentence.

The following relative pronouns are used in defining relative clauses.

These relative pronouns appear at the start of the defining relative clause and refer to a noun that appears earlier in the sentence. In the examples below, the common usage is given with the defining relative clause highlighted.

Local relationships on a single outcrop or archaeological site can often be interpreted to deduce the sequence in which the materials were assembled.

This then can be used to deduce the sequence of events and processes that took place or the history of that brief period of time as recorded in the rocks or soil.

The need to correlate over the rest of geologic time, to correlate nonfossiliferous units, and to calibrate the fossil time scale has led to the development of a specialized field that makes use of natural radioactive isotopes in order to calculate absolute isotopes has been improved to the point that for rocks 3 billion years old geologically meaningful errors of less than ±1 million years can be obtained.

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