The Rio Grande River separates Mexico from Texas. What most likely created the riverbed?
A. glaciers
B. plate collisions
C. volcanoes
D. water erosion

The diagram shows the results when two parents are crossed. the letters represent alleles for a trait that is controlled by three different genes. which best describes this inheritance pattern? multiple allele because a trait is controlled by three different genes polygenic because the offspring have alleles from both parents multiple allele because the offspring have alleles from both parents polygenic because a trait is controlled by three different genes