Water molecules made by living things become part of the water cycle through A. the dark reactions

B. the Krebs cycle

C. alcoholic fermentation

D. aerobic respiration

In which situations is the principle of cross-cutting relationship useful in determining relative age?

Which of the following statements is true? a. there are more chromosomes in an organism than there are genes. b. there are more genes in an organism that there are chemical bases. c. dna is made of sugar, phosphate, and carbon. d. genes are found in specific locations on a chromosome.

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays