The thing that holds the two sides of the double helix together is:

Compare the shapes of the bones of the human skull with the shapes of the bones of the human leg. how do the shapes differ? why are the shapes important?

Cells a and b are the same size and shape, but cell a is metabolically quiet and cell b is actively consuming oxygen. oxygen will diffuse more quickly into cell because . b the oxygen molecules inside cell b have a higher kinetic energy b. a its membrane transport proteins will not be saturated c. a the diffusion gradient there is shallowerd. b the diffusion gradient there is steeper

The recycling of water from the ground via runoff or transpiration through plants back into the atmosphere is known as part of the question 6 options: hydrogen cycle nitrogen cycle transpiration water cycle