Adaptors are unconscious, and can be signs of many things as they are menial gestures we create in response to certain situations. It's a form of nonverbal communication that doesn't really fall into any one category besides the first. My best guess is A, by this understanding.
Density is the amount of mass in a certain Volume. Air pressure results from a column of air pushing on an area. A measure of how tightly air molecules are packed together is called Density
Option 1B, 2A and 3B
Explanation:
Density is the mass amount of a substance held up to its volume in certainity to a ratio formula. So basically, density = mass per volume of a substance.
Air pressure, on the other hand, is the pressure which is being experienced by the columnar weight of air, when the air in an area is being pushing down.
The amount of mass of the air in the prescribed volume of air constitutes its density and hence the air molecules packed tightly in the volume presumed carries a mass and is noted as the density.
The answer is D because if organisms live in a desert biome then these organisms should be used to the hot temperatures, water loss, and strong winds.
Nitrogen takes steps through the Nitrogen Cycle, taking an active role in the lives of organisms and changing forms to meet their needs. In fact, nitrogen is a critical part of the development of plants, many farmers even add nitrogen to plants to make the grow bigger and more fruitful. Even the human body needs nitrogen to, which is good because most of the air we breath is nitrogen.