Which of the following reasons must a variety of methods be used to control protozoan?
1) As protozoan are so diverse, a sample infected with protozoan can have species that contain and do not contain a cell wall. As such multiple methods are needed to target different species
2) Protozoans have complex life cycles. As such, different methods are needed to target different phases in a protozoan's life cycle
3) Protozoan can create endospores. As such, different methods are needed to target those with and without endospores
4) Protozoans are infectious proteins that are hard to eliminate. As such, multiple methods are used to increase chances of elimination