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pelagic organisms

a water‐dwelling insect

a commensal

marine species

any genus of Protoctista

limnobios

an aquatic plant

intelligent beings

an order of protoctist

an organism that lives only in the presence of oxygen, called aerobe

heteroecious insects

aquatic carnivorous insects

a monad

multicellular organisms

a family of protoctist

aquatic herbs

low forms of life

bioplasm

a coccoid microorganism

an animal that belongs to the Silicoflagellate algal family

fastidious microorganisms

an animal that is hunted and eaten by another animal

organic life

life of a creature

an imaginary creature

an oriented movement of an organism in response to a current of fluid, called rheotaxis

of living things, to evolve

proterozoic life forms

a living thing

a single organism