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Vertebrate Characteristics, basic leve? At grade

Covers classification and characteristics of vertebrates.

It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).

Vertebrate Evolutio? At grade

An overview of vertebrate evolution and when important vertebrate traits evolved.

It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).

Reptile Reproductio? At grade

Describes reptile reproduction and the amniotic egg.

It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).

But Humpty Dumpty Didn't Rol? Advanced

Learn why bird eggs are oval-shaped instead of round, and the benefits of the amniotic egg.

It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in) ...

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