cutaneous
The working principle of any firearm is that burning gunpowder produces rapidly expanding gasses. Those expanding gasses push the bullet out of the barrel at high speed.
oxygen and nitrogen
Yes! He's the Nazi commandant who gasses Jews!
Its called Newton's Third Law. "When object A exerts a force on object B , then object B will exert an equal but opposite force back on A". When a rocket spews out hot gasses it's effectively exerting a force on the gasses. So the gasses exert the same force back on the rocket. The gasses accelerate one way and the rocket accelerates the other way. When Goddard first started experimenting with rockets some newspapers laughed at him because they thought the rocket would not be able to keep going once it got too far from the earth. But Goddard undestood Neton's Third law and knew the earth didn't have to be there for it to work.
The nucleus of a comet is mostly solid, while the coma and tail of the comet is composed of gasses and (we believe) a lot of dust. As the comet approaches the Sun, sunlight heats the nucleus of the comet and melts some of the frozen gasses, which sublimate into space carrying dust into space, forming the coma and the tail of the comet.
Oxygen and carbon dioxide.........I think.
Through temperature transfer, wind, exchange of gasses.
External Respiration is where gasses are absorbed into the blood through the alveolar capillary beds. Internal respiration is where the gasses are transferred into the cells from the blood.
Butterflies do indeed take part in the exchange of gasses. They need oxygen to breathe just like most living animals.
alveoli.
If they dried out they would no longer be able to let gasses pass through them.
Gas exchange takes place by book lungs .
Lenticel
exchange of nutrients and gasses with tissues
exchange of nutrients and gasses with tissues
Simple Diffusion
Fish breath (take in and exchange gasses) by passing water through their gill membranes which do the same job as our lung membranes.