Which creatures are the direct or indirect food o all the creatures on the ocean's surface ?

Which creatures are the direct or indirect food of all the creatures on the ocean's surface?

Which creatures are the direct or indirect food for all the creatures on the ocean's surface ?

Which function as direct or indirect food of all marine creatures ?

Which function as direct or indirect food of al marine creatures?

Which of the following factors are responsible for the change in the regular direction of the ocean currents in the Indian Ocean ?

Which of the creatures is oviparous?