Wet barometer - The tool works by measuring atmospheric pressure to predict incoming weather. Since the glass is only filled halfway with water, the other half is exposed to the atmosphere. When the outdoor atmospheric pressure rises, the pressure in the glass decreases, and causes the water to move down the spout.
Dry barometer - A Torricellian barometer (sometimes called a mercury barometer) is an inverted (upside-down) glass tube standing in a bath of mercury. Air pressure pushes down on the surface of the mercury, making some rise up the tube. The greater the air pressure, the higher the mercury rises.
I hope this helps!
The third one is the answer.
The first one is overproduction.
The second one is competition.
The third one is survival of the fittest, because if there are six grey mice and two brown mice in a brown field, which is more likely to be eaten by a predator? The grey mice are. Their genetic material helps them to survive and therefore be fit to their environment.
The more people that came to a certain place gained its population, while the people that left decreased the population .
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<span>due to their structure and function they are differ from each other</span>