Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas ,helium gas and dust , some nubelae 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 nubelae and stars are different

Mrs. smith ordered a root beer float (vanilla ice cream + root beer). mrs. smith noticed that the three states of matter (solid, liquid, and gas) all existed simultaneously in her root beer float. a. identify each phase of matter in the root beer float. b. describe the particles of all three phases of matter in the root beer float. (how are the particles arranged and moving? ) c. identify one phase change you would see in a root beer float and described what causes this change.

Embryos of different species look very similar, which shows that the organisms share a ancestor.

Consider the directing effects of the substituents on salicylamide and predict the possible structures of the iodination products. which do you think will be the major product?