Which of the following is the correct chain for the organism found in an aquatic community?

A food chain starts with a producer and then goes to bigger consumers. Phytoplankton make food by photosynthesis, so they come first.

Paramecium eats phytoplankton. Waterflea feeds on small organisms like Paramecium. Prawn eats the waterflea, tilapia eats the prawn, and shark eats tilapia. So the correct chain is Phytoplankton, Paramecium, Waterflea, Prawn, Tilapia, Shark.