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Unit 18: Biology Part 1 Page 6 of 60

Genus: Groups of species that are structurally similar or phylogenetically
related.

Gestation : time spent in the mother’s womb

Guano : bird droppings
Gut: An area in an organism used for digestion.

Harem : group of females which mate with a single male

Herbivore : Plant-eater

Host : bird that has an egg in its nest from a brood parasite

Hydroskeleton: Fluid-filled body cavity that provides support for muscle
contraction.

Incomplete digestive system: A digestive tract that has only one opening.

Innate Behavior : animal behavior that does not need to be learned
Insectivore : Insect-eater

Invertebrate: Animals without a backbone.

Kingdom : Large group of living things with common characteristics; the
domain in which living organisms are classified.

Leydig’s Organ : Organ found only in cartilaginous fishes that produces red
blood cells

Locomotion : Moving

Mammary gland : gland that releases milk for adult mammals to give to
their young

Marsupials : mammals that have a pouch in which the offspring lives
Medusa: Cnidarian with a bell-shaped body directed downward.

Metamorphosis : Major change in body shape and structure

Migration : Movement from one place to another

Mollusca: The phylum containing ten living classes of mollusks.

Mollusk: An invertebrate of a large phylum (Mollusca) that includes snails,
slugs, mussels, and octopuses. They have a soft, unsegmented body and
live in aquatic or damp habitats, and most kinds have an external calcareous
shell.

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