Obsidian,(underlined: which was used by early man to make arrowheads), is a naturally occurring glass.
A.
essential adverb clause
B.
nonessential adjective clause
C.
nonessential adverb phrase
D.
essential adjective phrase

Assp - why is it important to participate in a global economy? write a paragraph of 2 to 3 sentences that explains your answer?

(1) fire extended humans’ geographical boundaries by allowing them to travel into regions that were previously too cold to explore. (2) it also kept predators away, allowing early humans to sleep securely. (3) fire, in fact, has been a significant factor in human development and progress in many ways. (4) other obvious benefits of fire are its uses in cooking and in hunting. (5) probably even more important, however, is that learning to control fire allowed people to change the very rhythm of their lives. (6) before fire, the human daily cycle coincided with the rising and setting of the sun. (7) with fire, though, humans gained time to think and talk about the day’s events and to prepare strategies for coping with tomorrow. the sentence that expresses the main idea is: (type the number of the sentence. then click “go.”)

What is the meaning for a real looloo