Which of the following substances did Robert Brown observed upon forming the concept of Brownian motion? A. Talc powder suspended in water
B. Talc powder suspended in air
C. Pollen grains suspended in water
D. Pollen grains suspended in air

What approach is required to balance the objectives of sustainable development? balancing the objectives of sustainable development requires a(n) .

Match the following vocabulary terms to their definitions. 1. amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point 2. a measure of the kinetic energy of the particles of a substance 3. the amount of heat energy required to raise the temperature of 1 gram of liquid water from 14.5°c to 15.5°c 4. amount of energy required to change 1 gram of material from the liquid to the gaseous state at its boiling point 5. the amount of energy required to change 1 gram of a substance 1°c a. temperature b. latent heat of vaporization c. latent heat of fusion d. calorie e. specific heat

Which characteristics can be used to differentiate star systems? check all that apply.