Another student adds two different liquid samples together in a test tube, agitates the sample and notices a few bubbles formed at the top of the liquid layer. After further observation of the sample a minute later, he concludes that no reaction happened. Explain why, despite the observation of bubbles.

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.

Which activity is an innate behavior

The appropriate concentration for an iodine sanitizer is