a) Describe the two basic means by which living organisms obtain energy from the environment. Identify  one example of each, and explain  at least one similarity and one difference in biological structure that supports these two means of dealing with energy needs. 

b) Construct a diagram to show the direction of energy flow type of energy flowing release of heat impact of the sun on energy flow between the two classes of organisms you described above. Justify  the inefficiency of this system.