1. Which of the following is not made from synthetic materials?

A. a plastic cup
B. an aspirin pill
C. a glass window
D. a cotton T-shirt

2. Dental fillings/ crowns are an example of:

A. A polymer
B. A composite
C. A pure substance
D. A natural resource.

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.