All of the following are parts of the respiratory system except pharynx
brionchioles
septum
trachea

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

How does friction with the atmosphere affect the speed of an artificial satellite

Up until 1938, paleontologists accepted the idea that coelacanths (an ancient fish) went extinct at the time that they last appear in the fossil record, about 80 million years ago. but in 1938, a live coelacanth was discovered off the coast of south africa that was compared to the fossil record and found to be the same species what goal of science does this discovery represent