Construct a food chain using these organisms; zooplankton, Phytoplankton and tilapia fish. Enumerate two methods of water purification.

Here are the answers to the next questions:

2(a)ii: Construct a food chain using these organisms; zooplankton, phytoplankton and tilapia fish.
Phytoplankton $\rightarrow$ Zooplankton $\rightarrow$ Tilapia fish

2(b): Enumerate two methods of water purification.

1. Boiling
2. Filtration