In the biochemical assay lab, test tubes a and b were treated with onpg. after 15 minutes of incubation, test tube a turned a yellow color while test tube b remained a clear color. test tube contained which reacted with onpg to produce and .

Ifound this on google “here are some features of the alveoli that allow this: they give the lungs a really big surface area. they have moist, thin walls (just one cell thick) they have a lot of tiny blood vessels called capillaries.for more information go to the website below › bitesize › guidesi hope this you for what your looking for. can you plz mark me brainliest?

Used to water and cool climates, probably not thick coated or fluffy. they most likely have thin coats and have to survive to find food. sorry if this wasn't the answer you were looking for..: )