a chemical substance produced and released into the environment by an animal, especially a mammal or an insect, affecting the behavior or physiology of others of its species.
Organisms that use the same resources because there may not be enough for all, so it then becomes a competition of who gets it and who doesn't.
Hope this helps at least a little :)
Some clouds form as air warms up near the Earth's surface and rises. ... That warmed air starts to rise because, when warm, it is lighter and less dense than the air around it. As it rises, its pressure and temperature drop causing water vapor to condense.
https://scied.ucar.edu/learning-zone/clouds/how-clouds-form
I hope this helped :)
