Population of ground squirrels lived in a valley. the population was split in half when a river course changed, dividing the population in two separate groups. over many generations, the two groups changes so drastically, that an individual from group a cannot mate and produce offspring with an individual from group b. the result of this reproductive isolation is known

For me, the answer was just "speciation"

dna is made up of six smaller molecules -- a five carbon sugar called deoxyribose, a phosphate molecule and four different nitrogenous bases (adenine, thymine, cytosine and guanine).

ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).