Answer:
Birds do not have a diaphragm; instead, air is moved in and out of the respiratory system through pressure changes in the air sacs. ... Bird lungs do not expand or contract like the lungs of mammals. In mammalian lungs, the exchange of oxygen and carbon dioxide occurs in microscopic sacs in the lungs, called 'alveoli.
Explanation:
Your answer is <span>c. cell wall.
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The answer is TRUE!
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Answer:
Night or Day
Explanation:
when the earth is tilted towards the sun it is day and when it's titled away it is night
Kinetic:ocean power and hydroelectric power
thermal : geothermal and wind p;ower
chemical : biomass
