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metamorphosis

a series of distinct growth stages that are different from one another

complete metamorphosis

the animal goes through 4 distict changes

larva

an immature stage that does not resemble the adult

pupa

a non-feeding stage in which a hard case-like cocoon surrounds the organism

incomplete metamorphosis

the animal goes through 3 stages that occur gradually

nymph

similar to an adult form, but is smaller and lacks wings and reproductive structures

external fertilization

out of body joining of egg and sperm

internal fertilization

joining of sperm and egg cells inside a female body

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