She fills the cavity with cement, and the cement hardens into the shape of the roots.1 pointsimplecompoundcomplexcompound-complex

The sentence "She fills the cavity with cement, and the cement hardens into the shape of the roots." is a compound sentence.

Here's why:

A compound sentence is a sentence that has at least two independent clauses joined by a comma, semicolon or conjunction. An independent clause is a clause that has a subject and verb and forms a complete thought.

In the sentence, "She fills the cavity with cement" is the first independent clause - 'She' is the subject, 'fills' is the verb, and 'the cavity with cement' is the object.

"And the cement hardens into the shape of the roots" is the second independent clause - 'the cement' is the subject, 'hardens' is the verb, and 'into the shape of the roots' is the object.

These two independent clauses are joined by the coordinating conjunction 'and', making it a compound sentence.