Consider the following statements:
1. Some species of turtles are herbivores.
2. Some species of fish are herbivores.
3. Some species of marine mammals are herbivores.
4. Some species of snakes are viviparous.
Which of the statements given above are correct?
Explanation
1. Turtles as herbivores (Correct): While juvenile sea turtles are omnivorous, adult Green Sea Turtles (*Chelonia mydas*) feed almost exclusively on marine seagrasses and algae, making them herbivorous.
2. Fish as herbivores (Correct): Several marine and freshwater fish species, such as Parrotfish and Surgeonfish, feed primarily on marine benthic macroalgae and coral reef flora.
3. Marine mammals as herbivores (Correct): Sirenians, including Manatees and Dugongs (sea cows), are marine mammals whose diet consists entirely of seagrasses and aquatic plants.
4. Snakes as viviparous (Correct): While most reptiles lay eggs (oviparous), several snake species (such as green anacondas, boas, and certain sea snakes and vipers) retain embryos internally with placental nourishment, giving live birth directly (viviparous).
Therefore, all four statements are correct — Option D.