An unprotected traveler's blood would boil at normal body temperatures because the pressure is so low. Temperatures in the mesophere decreases with altitude, because there are few gas molecules in the mesophere to absorb the sun's radiation, the heat source is the stratosphere below. The air in the mesophere has extremely low density and as a result the air pressure is very low.
its definitely c because the past ancestors of ours never layed eggs nor did dogs, plus we were never reptiles and lastly, dogs and humans are both mamals and give live birth so their more related than snakes and humans. hope this helped.
