What is the primary role of the stomach in the human digestive system?
a. producing specialized salts that absorb fats
b. absorbing water and minerals from undigested food
c. using muscle movements and enzymes to break down food
d. transferring nutrients from digested food to the bloodstream

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.