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Proterozoic
An eon in the geologic timescale, following the Archean and preceding the Phanerozoic, characterized by the first evidence of oxygen in the atmosphere and multicellular life.
Incomplete Metamorphosis
A type of development in some insects, where the young resemble adults but are typically smaller and lack fully developed wings and reproductive structures.
Nymph
An immature form of some invertebrates, particularly insects, which undergoes gradual metamorphosis before reaching its adult stage.
Closed Circulatory System
A circulatory system where blood is enclosed within vessels and circulates unidirectionally from the heart through the body and back to the heart.
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