Which of the following statements is true about adaptations?

i. a species can adapt over the course of many generations.
ii. a single organism can adapt throughout its lifetime.

neither i nor ii
i only
both i and ii
ii only

What must happen before meiosis can begin? a. four gametes must be produced b. the four tetrads must be pulled apart c. dna doubles and produces sister chromatids d. the cell membrane pinches together

Which u.s. state lists the horned toad as its state reptile?

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