Examlex
Which factor of production earns profit?
Spicule
A small, needle-like structure or particle, made of calcium carbonate or silica, found in sponges and certain other invertebrates, providing support.
Cnidaria
A phylum of aquatic invertebrate animals that includes jellyfish, corals, and sea anemones, characterized by their specialized stinging cells.
Porifera
A phylum consisting of simple, multicellular organisms known as sponges, characterized by their porous bodies and lack of true tissues and organs.
Ctenophora
A phylum of marine animals commonly known as comb jellies, characterized by their gelatinous bodies and rows of ciliary plates.
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