All the objects are formed from the gas and dust orbitting the sun
Answer:
coal and oil come from the remains of dead animals.
Answer:
Nitrogen is an inert gas — meaning it doesn't chemically react with other gases — and it isn't toxic. But breathing pure nitrogen is deadly. That's because the gas displaces oxygen in the lungs. Unconsciousness can occur within one or two breaths, according to the U.S. Chemical Safety and Hazard Investigation Board.
Krista was most likely try to see how the amount of time she took to study reflected in her quizzes. She would most likely have higher scores if she studied longer. There is no information given on how her math scores are or how long she studies math so I can’t answer the third question. There’s no best way to study; everyone is different. Some rewrite notes and others make flash cards. You may like to be quizzed by someone. It just depends what works best for you.