What is the verb and predicate noun or adjective in this sentence: Rennett is an extract made from the lining of a calf's fourth stomach.

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Verb: is

Predicate noun: extract

In the sentence "Rennett is an extract made from the lining of a calf's fourth stomach," the verb is "is" and the predicate noun is "extract."

To identify the verb in a sentence, you can ask the question, "What is the action or state of being in the sentence?" In this case, the verb is "is" which shows a state of being or existence.

To identify the predicate noun, you need to find the noun that follows the verb and renames the subject. In the given sentence, "extract" is the noun that renames "Rennett" and completes the sentence's subject.

Therefore, the verb in the sentence is "is" and the predicate noun is "extract."