Seat belts in cars help prevent passenger injuries that would otherwise occur as a result of passengers remaining in motion during a car’s abrupt stop. Which of these laws predicts that an unrestrained moving body will continue to move? A. Law of inertia
B. Law of reflection
C. Law of universal gravitation
D. Law of conservation of momentum

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.