Final answer:
The subject of the main clause is 'taxonomist', and its predicate is 'is'; in the relative clause, 'who' serves as the subject, with 'classifies' being the predicate. Predicates describe actions or states and are essential in clarifying the meaning of sentences.
Step-by-step explanation:
In the given sentence, 'A taxonomist' is the subject of the main clause, as it names who the sentence is about. The predicate of the main clause is 'is', which is the verb that states the existence or a state of being of the subject.
In the relative clause, the subject is 'who' as it refers to the taxonomist and is being used to give additional information about the taxonomist. The predicate in the relative clause is 'classifies', describing the action the taxonomist performs on the plants and animals.
Predicates may include descriptive terms and play a critical role in conceptual analysis, which helps to clarify statements by identifying the right predicates for analysis and clarifying the relationships between them.