What is the complete predicate of an insect has no backbone?

The complete predicate of the sentence "An insect has no backbone" is has no backbone.

Here's why:

* Predicate: The predicate is the part of the sentence that tells us what the subject does or is.

* Subject: The subject is the part of the sentence that tells us who or what the sentence is about. In this case, the subject is "an insect".

* Complete Predicate: The complete predicate includes the verb and all the words that modify the verb, including objects, complements, and adverbs.

In this sentence, the verb is "has" and the rest of the predicate is "no backbone".