Category Nuances for null:

• tiny,
• undesirable,
• small,
• level,
• sensitive,
• whole,
• intermediate,
• herbivorous,
• smaller,
• abundant,
• gelatinous,
• beneficial,
• microscopic,
• marine,
• planktonic,
• pelagic,
• individual,
• active,
• trophic,
• lower,
• moving,
• dominant,
• large,
• macro,
• crustacean,
• micro,
• primitive,
• mobile,
• intertidal,
• bigger,
• heterotrophic,
• aquatic,
• invertebrate,
• larger,
• predatory,
• animal,
• natural,
• sexual,
• external,
• familiar,
• motile,
• unwanted,
• minute,
• harmful,
• benthic,
• parasitic,
• agile,

Simple Categories for null:

• organism,
• scavenger,
• item,
• crustacean,
• parasite,
• herbivore,
• host,
• microorganism,
• animal,
• fauna,
• arthropod,
• prey,
• web,
• invertebrate,
• zooplankton,
• predator,
• metazoan,
• plankton,
• creature,
• shellfish,
• critter,