Living things want to maintain , or stable conditions in their body. They do this by using feedback. They gather information through , like sight, taste, smell, hearing, and touch. These senses respond to a , or environmental message. This information travels through specialized cells called . The is the organ responsible for processing sensory information. We use these messages to control our response to stimuli called . Those may be stored in our brain as to help us make choices.

Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.

Ig national geographic you can search up all kinds of animals and bugs