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chordate

The phylum whose members have a notochord, a nerve cord, and slits in their throat area at some point in their lives.

notochord

A flexible rod that supports a chordate's back.

vertebra

The bones that make up the backbone of an animal.

ectotherm

An animal whose body does not produce much internal heat.

endotherm

An animal whose body regulates its own temperature by controlling the internal heat it produces.

fish

An ectothermic vertebrate that lives in the water and has fins.

cartilage

A tissue that is more flexible than bone.

swim bladder

An internal gas-filled organ that helps a bony fish stabilize its body at different water depths.

amphibian

An ectothermic vertebrate that spends its early life in water and its adult life on land.

tadpole

The larval form of a frog or toad.

lung

An organ found in air-breathing vertebrates that exchanges oxygen and carbon dioxide with the blood.

atrium

An upper chamber of the heart that receives blood.

ventricle

A lower chamber of the heart that pumps blood out to the lungs and body.

habitat

The specific environment in which an animal lives.

reptile

An ectothermic vertebrate that lays eggs and has lungs and scaly skin.

kidney

An organ that filters wastes from the blood.

urine

A watery fluid produced by the kidneys that contains wastes.

amniotic egg

An egg with a shell and internal membranes that keep the embryo moist; a major adaptation to life on land, characteristic of reptiles, birds, and egg-laying mammals.

fossil

The hardened remains or other evidence of a living thing that existed a long time ago.

sedimentary rock

Rock formed of hardened layers of sediments.

paleontologist

A scientist who studies extinct organisms, examines fossil structure, and makes comparisons to present-day organisms.

"He took the 5 loaves and 2 fish, and looking up to heaven, he gave thanks and broke them."

Luke 9:16

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