Enzymes are proteins that speed up chemical reactions by lowering the activation energy of the reaction. They are not used up in the reaction.

What do you think would happen if there were no enzymes in the human body?

If there were no enzymes in the human body old organelles would remain in the cell

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a

climate change and pollution

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .