Which body part represents the notochord in vertebrae’s a-backbone b-limbs c-head d-pharynx e-jaw

A. Backbone

Explanation:

The notochord is a rigid but flexible rod-like structure beneath the nerve cord that extends the length of the body. Muscles attach to the notochord.

I just did it on Plato and it was correct.

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explanation:

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.