Phylum Chordata

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Vocal sacs are absent in

_____________ filter-feed on brine shrimp and blue-green algae

They are homoiothermous animals, i.e., they are able to maintain a constant body temperature.

Notochord is restricted at the caudal end.

Largest living primate and powerful ape

Which of these cannot regulate their body temperature

Which of these show presence of brood pouch?

Includes modern flying birds with well developed flight muscles.