Engineers design a system for heating the air in a house. They want the heater to bring the temperature to a comfortable level and then maintain it.
Which option describes how the engineers should design the system?
O A. Include a control in the system that senses the air temperature
and causes negative feedback, reducing the output of the heater.
O B. Design the system with a control that maintains a constant level of
output from the heater.
C. Include a control in the system that varies the input level in a
regular cycle.
Design the system with a control that allows positive feedback to
enhance the heating ability of the system,

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.

He used pea plants to study the patterns of heredity.