Blood type is a type of gene where both alleles can be expressed. which statement best explains a person with ab blood type. (1 point)

a. there is a dominant relationship between alleles.

b. there is a codominant relationship between alleles.

c. there is an incomplete dominance between alleles.

d. the trait is polygenetic in nature.

Jayden is taking a test. he has to write why scientists support the theory that life began near hydrothermal vents in the ocean. which point should he include in his answer? a. hydrothermal vents were closest to ocean surface, and therefore could receive oxygen. b. oceans were dry and only had water near the hydrothermal vents in the earlier ages. c. even today, all life forms are first born near hydrothermal vents and they later migrate to land. d. fossils of archeabacteria, which are early common ancestors, were found near hydrothermal vents.