Question

add hyphens to compound adjectives where necessary. if no hyphens are needed, submit the text without making any changes. nick studied the diagram for a water pump he planned to build, which was wind powered and used no electricity.

Explanation:

Compound adjectives modify nouns. Here, "wind - powered" is a compound adjective describing the water - pump. A hyphen is needed to connect the two words to show they function as a single modifier.

Answer:

Nick studied the diagram for a water pump he planned to build, which was wind - powered and used no electricity.