1000
5000
6000 km
2000 3000 4000
depth below earth's surface
what is the approximate thickness of zone c?
a. 650 km
b. 1600 km
d. 2900 km
c.
2250 km

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 part of the brain is highlighted in the diagram below?

What molecule does hemoglobin decay into over time