How does external respiration differ from internal respiration?

Lina went camping in the woods. while camping, she accidentally touched a strange plant. her hand immediately started itching, and her skin erupted in hives. after she got home, her grandmother cooked some oatmeal, wrapped it in a cloth, and put it on lina’s affected hand. lina’s grandmother followed a traditional remedy.

Which finger should not be used when measuring heart rate?

During the first month of development, how many layers of cells make up the embryo? a. 1 b. 2 c. 3 d. 4