Choose the correct answer. Which best identifies a run-on sentence? A lion can run faster than a greyhound or a fox. Bald eagles build nests of branches; the nests may weigh tons. Humpback whales sing songs every year. Some tortoises are huge, you can ride on them.
Some tortoises are huge, you can ride on them. This is a run-on because u cannot separate two independent clauses with just a comma. You need a comma + conjunction or a semi-colon.