Statement 1 is Incorrect: Copepods are a group of small crustaceans found in nearly every freshwater and saltwater habitat; they are zooplankton that function as consumers (secondary producers) rather than primary producers. Statement 2 is Correct: Cyanobacteria are photosynthetic bacteria that obtain energy through photosynthesis and are significant primary producers in marine environments. Statement 3 is Correct: Diatoms are a major group of microalgae (phytoplankton) found in the oceans and are among the most important primary producers in the marine food chain. Statement 4 is Incorrect: Foraminifera are single-celled amoeboid protists that primarily function as consumers (zooplankton) by catching food with their ectoplasm.