Author Question: There are numerous gases in our atmosphere; however, the dominant gases are which of the following? ... (Read 73 times)

Awilson837 · **on:** Aug 22, 2018

There are numerous gases in our atmosphere; however, the dominant gases are which of the following?

a) Nitrogen and oxygen
b) Carbon dioxide and argon
c) Nitrogen and carbon dioxide
d) Trace gases and oxygen
e) Oxygen and carbon dioxide

Question 2

Why do you think that most cetaceans use sound for communication and echo-location?

a) Sound travels farther through water than light
b) The ancestors of these organisms had vocal chords, so they adapted to project sound in water
c) Cetaceans have ears so they can hear sounds that fish cannot
d) Cetaceans have developed a simple language for communication
e) Cetacean skulls are specially adapted for sound transmission