PLANKTON
- Phytoplankton is on the bottom of the food chain
- Then comes barcterioplankton
- After that comes zooplankton
Phytoplankton is on the bottom of the food chain because it is a producer! It uses photosynthesis to combine sunlight with water and carbon dioxide to create carbohydrates for nutrients.
Barcterioplankton is a primary consumer. It eats phytoplankton.
Zooplankton is also a primary consumer. It eats barcterioplankton and phytoplankton. It is the top of the food web for plankton.