2. If the plankton in the example above makes 15,000 calories
of energy from photosynthesis, how much energy is available
to the krill? Small fish? Medium fish? Large fish? Gull?

Energy available to krill is 1500 calories

Explanation:

Energy produced by phytoplankton = 15,000 calories

Energy available to krill = ?

Along the food chain, only 10% of energy is transferred to the organism of higher trophic level.

Thus,

energy available to krill =

                                       = 1500 calories

Energy available to small fish =

                                                 = 150 calories

Energy available to medium fish =

                                                      = 15 calories

Energy available to large fish =

                                                 = 1.5 calories