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

the answer is d.) homologous; have mammary glands

cellular respiration oxidizes food into energy in the form of atps.

glycolysis (6 c hexose) > 2x atps are used > 6c hexose biphosphate > 2 x 3c triphosphate >

2 x 3c pyruvate (2x nadh produced from nad) and (4x atp produced)

pyruvate actively pumped mitochondrial matrix.