Cancer research project | Biology homework help

There are two types of surveillance for diseases of interest, which are active and passive. Cancer  is the disease you need to research for this project. Answer the following questions:

1. Does the disease I selected have active or passive surveillance systems in place and why? (300 minimum words for passive surveillance) and (300 minimum words for active surveillance)

2. What are the limitations of these surveillance systems? (give at least 2 types of surveillance systems 300 words minimum each)

3. What is the case definition for this disease? How might changing the case definition impact surveillance?