Which change of state occurs at 0 °c when heat energy has been removed from liquid water? a. boiling b. melting c. freezing d. condensing

Which best describes meiosis? a. it produces cells that are identical to the original cell b. it is responsible for the replacement of damaged skin cells c. it is responsible for growth of the organism d. it produces male and female sex cells

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?

What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen