In which part of the circulatory system is blood brought directly to the tissues? a. in the arteries
b. in the arterioles
c. in the capillaries
d in the veins

6. in the dna double helix, how are the two strands of dna held together? a. chemical bonds between base pairs hold the two strands of dna together. b. hydrogen bonds between the base pairs hold the two strands of dna together. c. hydrogen bonds between sugar groups and phosphate groups hold the two strands of dna together. d. chemical bonds between sugar groups and phosphate groups hold the two strands of dna together.

What does all of the organ system in a human form

Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?