Actual gas exchange takes place in the
A)Trachea
B)Bronchi
C)Larynx
D)Alveoli

Which of the following systems in absorbing oxygen and releases carbon dioxide

Imagine a rocket launching from earth and travelling to the moon. in which order would the rocket pass through the layers of the atmosphere? thermosphere, mesosphere, stratosphere, troposphere troposphere, mesosphere, stratosphere, troposphere thermosphere, stratosphere, mesosphere, troposphere troposphere, stratosphere, mesosphere, thermosphere

If animal agriculture was eliminated, how much grain would become available for human consumption?