Who created the camera

(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.”)

According to the author, where can we find the answer to our nation’s “most pressing problem”? does that seem logical?

Read the rough-draft paragraph. exercising daily is one of the best ways to the body fight fatigue, illness, stress, and weight gain. whether taking a bike ride, enjoying a walk, or going for a swim, the type of activity is not as important as exercising consistently. often, people begin the new year with the resolution of exercising, but within a few months that commitment is quickly forgotten. the key is to choose something that is accessible, enjoyable, and affordable. exercising just thirty minutes a day not only strengthens the heart and lungs, but it also to boost one’s energy. another way to feel more energized is to eat a balanced diet. since no single food item can supply the body with everything it needs, it is important to eat a variety of foods. so to maintain a long, happy life, get out there and get moving, and enjoy a wide range of healthy meals. which statement best describes the mistake the writer makes in this paragraph?