Which group of organisms are considered primary producers in marine ecosystems?

• A. Coral
• B. Fish
• C. Phytoplankton
• D. Zooplankton

Answer: (C)

Verified step by step guidance

1. Understand the role of primary producers in ecosystems: Primary producers are organisms that can produce their own food through photosynthesis or chemosynthesis, forming the base of the food chain.
2. Identify the characteristics of marine primary producers: In marine ecosystems, primary producers are typically photosynthetic organisms that convert sunlight into energy.
3. Examine the options provided: Coral, Fish, Phytoplankton, and Zooplankton.
4. Coral and Fish are not primary producers: Coral are animals that often have symbiotic relationships with algae, and fish are consumers that rely on other organisms for food.
5. Phytoplankton are the primary producers: Phytoplankton are microscopic algae that perform photosynthesis, making them the primary producers in marine ecosystems.