In a marine food web, what term describes an organism that eats primary producers?

• A. Primary Producer
• B. Nutrient
• C. Scientific Name
• D. Primary Consumer

Answer: (D)

The main idea here is how energy moves through a food web. Organisms that perform photosynthesis—primary producers like phytoplankton and algae—form the base by making energy-rich organic matter. An organism that eats these producers is a primary consumer, often an herbivore in marine systems. This category includes creatures such as zooplankton that feed on phytoplankton or sea urchins that graze on algae. The other options don’t fit: a primary producer is the maker of energy, a nutrient isn’t a consumer, and a scientific name is just taxonomy. So the correct term for an organism that eats primary producers is primary consumer.