Which example shows an organism maintaining homeostasis?
a. a lizard changing color to avoid a predator
b. a person sweating on a hot day
c. a bacterium dividing into two
d. a chicken laying eggs

The example that shows an organism maintaining homeostasis is b. a person sweating on a hot day. Homeostasis is an organism's ability to maintain a stable internal environment irrespective of the external environment. When a person's body overheats, the body releases water as perspiration or sweat to cool itself down. Another example is when a person gets cold, the hair on his arms and legs, stand up straight - to trap air circulating round his body, and heat it up. 

Processes above and be sure to mention the movement of electrons and energy as the carbon atom moves from one reaction to another.