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Animals, Invertebrates

A list of words for English spelling and vocabulary help and learning. For further help, teaching and lessons about spelling please try our spelling course.

amoeba
An amoeba is a unicellular organism.
cell
A cell is the basic structural and functional unit of all organisms.
nucleus
Nucleus is a scientific term used for the central part of the cell.
coral
A coral is a marine colonial polyp characterized by a calcareous skeleton.
polyp
A polyp is usually sedentary with a hollow cylindrical body and a ring of tentacles around the mouth.
earthworm
An earthworm is a terrestrial worm that burrows into and helps aerate soil.
jellyfish
A jellyfish is a free-swimming coelenterate with stinging tentacles.
leech
A leech is a bloodsucking creature that looks like a worm.
metazoan
A metazoan is an animal of the subkingdom Metazoa.
protoplasm
Protoplasm is the substance of a living cell.
protozoan
A protozoan is a single-celled microscopic animal.
pseudopod
A pseudopod is a temporary outgrowth used by some microorganisms as an organ of feeding or locomotion.
sponge
A sponge is a porous mass of interlacing fibers that forms the internal skeleton of various marine animals.
sucker
A sucker is an organ specialized for sucking nourishment or for adhering to objects by suction.
umbrella
An umbrella the disc of a jellyfish used to move through water.
worm
A worm is relatively small elongated animal that burrows through earth.

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