The Baleen whale is the largest animal on earth yet it survives by consuming some of the smallest organisms in the ocean. What must be true in order for the Baleen whale to be sustainable? There must be enough Phytoplankton to support enough Krill to sustain the whale.

The number of Krill is the only thing that matters in the environment because Krill are photosynthetic.

The number of Krill is the only thing that directly affects the whale because its the only thing the whale eats.

The whale can easily find other sources of food in the ocean to sustain itself.