Phytoplankton, shown on the left in the image below, are microscopic organisms that can be found in freshwater and salt water environments. they perform photosynthesis to get energy and act as an important food source for larger organisms. which characteristic is found in the whale but not in the phytoplankton? heterotrophic cell walls unicellularity prokaryote cells

The right answer is heterotrophic.

Phytoplankton is plant plankton, that is to say, all plant organisms living in suspension in water. More precisely, it concerns all autotrophic plankton species with respect to carbon (including bacteria such as cyanobacteria, formerly "blue-green algae").

Phytoplankton produces half of the oxygen consumed by all heterotrophic living things and volcanoes (they consume oxygen by burning organic carbon from sediments in the subduction zones). It captures solar energy through photosynthesis.

Whales are large marine mammals classified in the order Cetacea. And it is known that mammals are heterotrophic living beings (need to feed on pre-existing organic constituents).