Trace the flow of energy through a typical food chain (describing "what eats what"), including the original source of that energy and its ultimate form after use. underline each form of energy or energy-storing molecule, and boldface each process which transfers or transforms energy.

The answer is given below:

Explanation:

A food chain consists of producers and different consumers. Producers are the organisms which produces food using sun energy. Consumes directly eats plants or eat other animals to fulfill their energy needs. So, in any ecosystem energy flows through food chain in unidirectionl manner.

Sun is the ultimate source of energy. The producers uses solar energy to make chemical energy (glucose) through photosyntheis. The cosumers use this chemical enegy through food by eating plants. Some animals eat other animals to get energy. The chemical energy stored as ATP (an energy currency).  

b - the respond is innate and varies over time.

good luck!

i believe the answer would be b. hope it : )