Question

which type of sentence is this? annual plants survive only one season and must be replaced each year, but perennials return each year with new flowers and foliage. simple compound complex compound-complex

Explanation:

A compound sentence connects two independent clauses (complete thoughts) with a coordinating conjunction (here, "but"). The given sentence has two independent clauses: 1) "Annual plants survive only one season and must be replaced each year" and 2) "perennials return each year with new flowers and foliage", joined by "but".

Answer:

compound