Causation in Populations: Exercise 1

Exercise Context:
The following interactive exercise is our standard artifical way of discovering part of the causal structure. In this case we are investigating getting Lyme Disease for Willie:
Question 1-1:
Fill in the causal structure for getting Lyme Disease for Willie below.
Question 1-2:
Question 1-3:
Question 1-4:

Proceed to Exercise:
1 2-1 2-2