The Answer is: C
Because of the volume that is already set by the size and weight of the container. In other words the gas is pushing all particles out of the way and replacing its self therefore the pressure increases.
Answer:
Birds have a significant number of reduced muscles to help them reduce their weight. The most-developed muscles in birds are the flight muscles that they need to fly. The bones are mostly fused, reducing the need for muscles to hold the bones together. The skulls of birds are very thin and the beaks are very light.
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The answer is e.
The troposphere.
