D development of vestigial structures.
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Answer:
B)
Explanation:
CirculaTory system transports oxygen to the cells.
Because for men, the gene is dominant, and for women, it is recessive, thus a man only requires one allele for baldness to occur, and a woman must be homozygous for the trait.
In general, echinoderms typically respire by simple diffusion, using gills or specialized projections, like tube feet or pockets, to circulate water and oxygen through their bodies. Many echinoderms also use a simple hemal system, a series of pockets and tubes that serves almost like a net of veins and arteries.
