Answer:
B. genotype
Explanation:
Genotype determines an organism's phenotype.
I am sorry, I am not good in this area but, I found a site that could help you: http://www.chemicalelements.com/elements/ca.html
I know I am not supposed to post links but, I found help
The fetal membrane meets all the characteristics.
Hope it helped!
A. The surface area to volume ratio increases