In serial or tandem staging<span> schemes, the first </span>stage<span> is at the bottom and is usually the largest, the </span>second stage<span> and subsequent upper </span>stages<span> are above it, usually decreasing in size. In parallel </span>staging<span> schemes solid or liquid </span>rocket<span> boosters are used to assist with lift-off.</span>
Answer:
A measure of how much water vapor there is in the air.
Explanation:
Dampness, especially that of the air.
The amount of water vapour in the air.
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To match and help even out the other species in the ecosystem.
So sorry not sure I would say part A but not a 100% sure