Why does milk have to be kept in refrigerator? Choices: 1-The reactions that cause milk to spoil are slower at lower temps
2- Physical changes that cause milk to spoil are slower at lower temps
3- no chemical or physical changes can occur at lower temps

Which statement correctly describes other ways in which nebulae and stars are different? a. a star always has a higher density than a nebula. b. stars can form inside a nebula but a nebula can never be produced by any star. 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. reset submit