respiratory surfaces, such as alveoli in the lungs, often have a simple layers system of epithelial tissue at the site of gas exchange. what is the benefit of this arrangement

Which of the four major uses is predicted to change the least by 2020?

What are the doorways into and out of cells, attached to the membrane, and built in the rough er.

In pea plants, the allele for inflated pod seed, i, is dominant over the allele for constricted pod seed, i. the punnett square shows a cross for this trait. which offspring will be homozygous dominant