Which sentence best shows correct comma usage?
native american groups include the mayan the aztec, and the toltec people.
native american groups, include the mayan the aztec and the toltec people.
native american groups include the mayan, the aztec and the toltec people,
native american groups include the mayan, the aztec, and the toltec people.

What is the main purpose of a speech bubble in a graphic novel ?

The enemy attacked the headquarters. what is the action verb in the sentence?

Which detail belongs in paragraph 5 to support the main idea of the paragraph? a) places to receive acupuncture are increasingly easy to find all across the united states. b) not everyone is necessarily fond of acupuncture; some patients prefer other methods of physical therapy. c) even though acupuncture is a popular chinese treatment, it has grown popular around the world. d) most of the adverse effects of acupuncture that have been reported do not derive from the procedure itself but from improper application.