Answer: C
Explanation: Smaller single-celled organisms have a high surface area to volume ratio, which allows them to rely on oxygen and material diffusing into the cell (and wastes diffusing out) in order to survive. The higher the surface area to volume ratio they have, the more effective this process can be.
Answer:
A. containers A and B represent mixtures
<span>The respiratory membrane is a combination of " Alveolar and Capillary walls and their fused basement membranes"
Hope this helps!</span>
Men have xy and women have xx chromosomes. the mens sperm is the chromosome that determines the sex of the child. x is female and y is male so the answer is male