A red blood cell is in the umbilical artery of a fetus. Where will it flow next, in the proper order?

A) Umbilical vein; chorion; ductus arteriosus

B) Chorion; umbilical vein; ductus arteriosus

C) Chorion; umbilical vein; ductus venosus

D) Umbilical vein; chorion; ductus venosus

Asmall number of finches are removed randomly from the wild and placed in a protected bird area. they are given as much food as they need and have plenty of space. why would natural selection not occur in this population? a. there is no reason for genetic mutation to occur. b. the birds compete for limited resources, c. the population has not reached carrying capacity. d. there is no genetic variation in the finches.

What type of reaction is photosynthesis

Your sense of touch depends upon: a. direct contact b. heat chemical c. reactions d. pain