When the mouth develops from the first opening in the gastrula, the organism is called a deuterostome.
a. true
b. false

False.

Explanation:

Classification of organism is important to classify them in similar and different groups. Organisms can be classified on the basis of the development of the mouth or the anus first.

The organism in which mouth develops first by the opening of gastrula are called protostome not deuterostomes. Deuterostome develop anus first from the opening of gastrula.

Thus, the correct answer is option (b).

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