Which activity involves only a physical change?

a. acid bubbling on a rock

b. grinding coffee beans

c. exploding fireworks

d. baking cookies

Which phrase best summarizes the theory of evolution by natural selection? a. Only the strongest animals survive. b. Life must come from other life. c. Populations change over long periods of time. d.

Which statement best describes the explanatory powers of hypotheses and theories? A hypothesis does not provide an explanation but instead only predicts what may happen.

Identify Earth's six global wind belts.

I have involvement in the immune system

Why the carbon dioxide in the biodome decreased?

If the plankton contain 100,000 kcal of energy, about how much energy will the manta ray obtain from eating the starfish? A 10 kcal B 100 kcal C 1,000 kcal D 10,000 kcal

A population is growing exponentially what can you conclude

What is described in the following equation? 2H2 (g) + O2 (g) → 2H2O (l) A. helium gas combining with oxygen gas to form water B. hydrogen gas combining with oxygen gas to form water C. hydrogen gas combining with water gas to form hydroxide D.

During the polymerase chain reaction, the two DNA strands are separated at 95°C, after which the reaction mixture is cooled to 54°C to allow the primers to hybridize to the DNA strands.

Which of the following describes a benefit of membership in research community?