A) Energy is captured by plants, then transferred to consumers and decomposers, and eventually lost as heat.
B) Plant cells adjust the openings on the bottom of leaves to respond to changes in water availability in order to maintain moisture inside the leaf.
C) Sensors detect changing CO2 levels in the blood and trigger an increase or decrease in the rate of breathing to bring the CO2 back into balance..
D) Feelings of hunger and then fullness affect the length of time and quantity of food you eat, keeping your weight near a “set point.” (set point means it does not change too much).
E) When body temperature drops, you shiver which generates heat; when your body heats up, you sweat and the evaporation cools you.