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Food is prevented from entering the trachea by the

White blood cells fight infection by

The small intestines receive

The four defining characteristics of chordates are

Which of the following features were required for the the evolution of the amphibians?

Food is prevented from entering the trachea by the

Match the cavities with the correct letter in the diagram below.

Which feature is found in the bony fish but not in the cartilaginous fish?

The liver functions in digestion by

The four defining characteristics of chordates are