Which does not affect the rate of pulmonary and systemic gas exchange?

a. partial pressure of the gases.

b. surface area available for gas exchange.

c. diffusion distance.

d. number of gases to be exchanged.

e. molecular weight and solubility of the gases?

Select all of the methods through which a drug can enter your body. injection swallowing inhalation absorption

Magnesium is the limiting reactant in this experiment. calculate the theoretical yield of mgo for each trial. trial 1: trial 2: data mass of empty crucible with lid trial 1: 26.688 trial 2: 26.681 mass of mg metal, crucible, and lid trial 1: 26.994 trial: 2 26.985 mass of mgo, crucible, and lid trial 1: 27.188 trial 2: 27.180

Scientists discovered fossils in several layers of the earth you see here. they found fossils of algae, snails, and clams in layer d. given that information, where do you think they found fossil evidence of simple land plants and amphibians?