For example, when you feel hungry, your body is telling you to get food substance into your stomach. You then eat food and your body starts taking in the nutrients from the food and cycling it around the body.
Your body is also trying to keep inside your body equal with outside your body. When one is unbalanced, your body does actions to counteract the unbalance. An example of this is when it is hot and you sweat. The sweat is the body trying to cool itself down.
Homeostasis is when the body is made sure to have a constant environment inside so that the body can work at it's optimum conditions .... constant temperature, constant pH etc ... you do sweat when you feel hot but you can't control it... your mind just tells it to... vadodilation and vasoconstriction for a constant temperature occurs for a constant temperature as well(when vessels dilate and constrict), your mind allows the vessels to do so without you thinking about it.
The proportion of mottled fish will
increase over time because of the construction company that dumps a load of
gravel in the bottom of the lake which give it a mottled appearance that made
the mottled fish invisible by their major predator which is the wading bird that hunts them
by sight.