Only answer if you have an answer to the question. Thank you.

A familiar example of homeostatic regulation in a mechanical system is the action of a thermostat, a machine that regulates room temperature.

Explanation:

Humans' internal body temperature is a great example of homeostasis. When someone is healthy, their body maintains a temperature close to 98.6 degrees Fahrenheit (37 degrees Celsius). Being warm-blooded creatures, humans can increase or decrease temperature internally to keep it at a desirable level.

Explanation:

i'm pretty sure it's spores

coal is not sustainable because it will one day run out.