In a marine ecosystem, phytoplankton perform photosynthesis. krill eat the phytoplankton, and seals, whales, and sea birds feed on the krill. finally, great white sharks hunt and eat the seals. which of these organisms are consumers?

Except phytoplankton, all are consumers

Explanation:

Consumers are those which directly or indirectly depends on autotrophs for food.

Here

Krill is primary consumers

Seals, whale, sea birds are 2° consumers and primary carnivores.

Shark is 3° consumer and 2° carnivore..or top carnivore

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.