Why doesn't the mothers blood mix with that of the baby in the womb?

Each trait of a plant is determined a. an allele b. one gene c. a pair of genes d. one dominant gene

Students in biology are studying the macromolecules of life. they used a calorimeter to determine the calories in various types of food. once the lab was completed, the students ate the left over food samples. monica commented that in just 6 or 7 "chews" of the saltine, it was gone; nothing but a sticky paste in her mouth. elaborate on what happened chemically while chewing the saltine. include the macromolecules present.

Cells are adapted to preform specific functions. which of the following terms refers to this capability?