Darwin's book suggested that organisms evolve through natural selection.
Alveoli are found in lungs and exchamge O2 and Co2 !!
so answer is last one !!
Compounds are made up of elements.
Elements are the ones we pull straight out from the periodic table.
For example:
H2O, HCl, NaCl, NaOH --> these are all compounds
H, N, B, Ne, Na, Cl, O, K --> these are all elements.
Answer:
gas moves more freely because it has loosely arranged molecules
Explanation:
carbon dioxide Coronavirus
