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Unit 18: Biology Part 1 Page 4 of 60

Key Vocabulary

Amniotes : Animals whose embryos are surrounded in amniotic fluid

Animal: Organisms in the kingdom Animalia.
Annilida: Invertebrate worms that have segmented bodies, such as
earthworms.

Aquatic : Living in the water

Arboreal : Living in trees

Arthropoda: The phylum meaning “jointed feet;” includes four living
subphyla of arthropods.

Bilateral Symmetry : Body plan in which the left and right side are mirror
images.

Bipedal : walking on two legs

Body cavity: A space inside an organism used for digestion or more.
Book Lungs: Gills modified for breathing air.

Brachiation : Moving by swinging

Brackish : Slightly salty

Brood parasite : bird that lays its eggs in the nest of another bird

Camouflage : blending in with non-living things around you

Carapace: The thick dorsal shield seen in many crustaceans; often forms a
protective chamber for the gills.

Carnivore : Meat-eater
Cartilage : The flexible material that makes up the human outer ear and

nose, and the body of some fish

Cartilaginous Fishes : Group of fish with bodies made of cartilage instead of
bone
Cell colonies: Groups of cells which work together; coral reefs, for example.

Cephalization : Having most nervous tissue concentrated in one part of the
body

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