Question

find the relative clause. if it is nonrestrictive, set it off with commas. if it is restrictive, submit the text without making any changes. when adding organic materials to a compost pile, gardeners should avoid animal products and fats in favor of scraps from plants that have not been treated with pesticides.

Explanation:

A relative clause is a dependent clause that modifies a noun or pronoun. In this sentence, "that have not been treated with pesticides" is a relative clause modifying the noun "scraps from plants". A restrictive relative clause provides essential information about the noun it modifies and is not set off by commas. Since the clause "that have not been treated with pesticides" is necessary to identify which plant scraps gardeners should use (as opposed to plant scraps that have been treated with pesticides), it is a restrictive relative clause.

Answer:

When adding organic materials to a compost pile, gardeners should avoid animal products and fats in favor of scraps from plants that have not been treated with pesticides.