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N. The partition dividing the nostrils. It is composed of bone and cartilage covered by mucous...

The partition dividing the nostrils. It is composed of bone and cartilage covered by mucous...

The strip of skin running from the tip of the nose to the upper lip, which separates the...

Any bright-colored fish of the genera Chaetodon, Pomacentrus, Apogon, and related genera, which...

N. A mass of epithelial cells temporarily occluding an embryonic opening, most commonly of the...