Need help fast please I am timed and giving 47 points. Four groups of students plan scientific investigations to answer four questions for the science fair.

Questions for Science Fair:

1-What kinds of plant life grow naturally in the town parks?

2-Which types of treats do different breeds of dogs like best?

3-Do different types of grass affect how far a ball rolls?

4-How are the chemicals in different vegetables similar?

Which question would most likely be answered with an experimental investigation?

A-1
B-2
C-2
D-4

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.