Most of the primary production carried out in the open ocean is performed by:

Question

Quizplus · Accepted Answer

Phytoplankton, which are small, free-floating algae, are responsible for most of the primary production in the open ocean. They are the base of the food chain and support a variety of marine organisms, from zooplankton to large fish and marine mammals. Seaweeds, kelps, and seagrasses are primarily found in coastal areas, while zooxanthellae are symbiotic algae found in corals and other invertebrates.

Most of the Primary Production Carried Out in the Open