Question

whoa, hold your seahorses! they have a tail and a head that looks somewhat like a horse. they live in the sea. so, seahorse is not a totally unexpected name for this unique fish that is found in seas around the world. seahorses are bony fish that do not have scales like other fish. their bodies are covered with a thin skin. the skin covers rings of bony plates. seahorses swim upright—like they are standing and swimming at the same time. however, this unusual swimming position means they are not fast swimmers. which 3 details describe the seahorses swimming position? unusual horizontal upright not fast

Explanation:

El texto dice que los caballitos de mar nadan en posición vertical (upright), que es una forma poco común (unusual) de nadar y que debido a esta posición no son nadadores rápidos (not fast). No se menciona nada sobre una posición horizontal.

Answer:

unusual, upright, not fast