Answer:
The question there is really blur and it's hard to understand..
Insulin is a chemical that is produced by the pancreas and controls blood sugar.
Hope this helps!
Answer:
C=2πr
Explanation: The circumference = π x the diameter of the circle (Pi multiplied by the diameter of the circle). Simply divide the circumference by π and you will have the length of the diameter. The diameter is just the radius times two, so divide the diameter by two and you will have the radius of the circle!
Answer:
I will say chemical which is drug, in this aspect we should be looking at drug abuse. Too much misuse of drugs can affect the brain,mainly causes of mental illnesses can be traced to the brain. An example of drug abuse is the intake of cocaine to make one high. Symptoms include being unreasonable,nuisance and even paranoia.
Yes, there are sometimes earthquakes in South America. :)