observation is made using one or more of the five senses. An independent variable is a variable that’s changed in an experiment. An explanation based on an observation is a/an . There may be only one variable in an experiment. observation is made using tools or measurement. What’s the difference between an observation and inference?

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