Is this a run-on sentence?

American badgers construct burrows underground for protection.

Is the sentence the refree blew her whistle and both teams rushed onto the field a coumpound or simple sentence

When greg came home for lunch, he realized that his air conditioner was broken. fragment, run on or complete sentence?

Preview the following sentence and identify the meaning of the underlined word in the sentence. the brain was riddled with holes, it looked like a sponge. a. bridled c. perforated b. pierced d. b and c select the best answer from the choices provided a b c d mark this and return