The main reason why fish with lungs and gulp air are not grouped with ''amphibians'' is because
a) they are not vertebrates
b) they do not have lungs
c) they do not have teeth
d) they do not have 4 appendages
e) they do not have scales

Why should the united state be concerned about air pollution in china?

How did the miller-urey experiment impact the way scientists think about the origins of life? use what you know about the miller-urey experiments to discuss the factors needed for life to arise, and speculate on whether life could arise on another planet.

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -