30.) A calorie is a unit of energy.
31.) A reflex causes an organism to respond to a sudden change.
32.) Respiration removes carbon dioxide from the air and into your lungs.
33.) Wind is a renewable source of energy.
34.) A chemical reaction because it is burning and releasing heat.
35.) Not sure, but I think it's volume.
36.) A decrease in food would cause the merlins to decrease as well.