well depends what your doing :D
All of them. That's why they exist.
nervous system
The central nervous system.
the body does not react well to bacteria. It can be harmful to your body and can start disease
Respond
There are 7 characteristics of life one of which is irritability, meaning an organism needs to be able to react to its environment, this characteristic or instinct is what causes organisms to react to their environment. The ability to ajust to this change in their environment is adaption.
There are 7 characteristics of life one of which is irritability, meaning an organism needs to be able to react to its environment, this characteristic or instinct is what causes organisms to react to their environment. The ability to ajust to this change in their environment is adaption.
Thermoreceptors react to changes in temperature, either hot or cold, in their surrounding environment. They send signals to the brain when there is a difference in temperature to help regulate the body's temperature.
hahaha
Nerves serve two functions for the body. They give orders to the brain that direct organs and tissues and they send signals about the body's condition or environment to the brain, directing the body to react.
No, all organisms react to their environment to survive.
Rainwater.