Problem: Key evolutionary advances of the solid worms are bilateral symmetry and:a. a coelomb. internal organsc. a one-way digestive tractd. a body cavitye. a circulatory system

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Key evolutionary advances of the solid worms are bilateral symmetry and:

a. a coelom

b. internal organs

c. a one-way digestive tract

d. a body cavity

e. a circulatory system