Assertion : Branchiostoma and Balanoglossus are bilaterally symmetrical and triploblastic animals. Reason : They are exclusively marine and possess notochord.

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Balanoglossus (Phylum-Hemichordata) and Branchiostoma (= Amphioxus, Subphylum - Cephalochordata) both are bilaterally symmetrical and triploblastic animals. Both are marine animals. Balanoglossus does not possess a notochord whereas Branchiostoma being a chordate possesses notochord that persists throughout life.

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