need help please

Traversable Networks

Answer the following questions:

1. Look at the networks where all the vertices are even. Are these networks traversable?

2. Look at the networks were only two vertices are odd. Are this network's traversable?
Where must you start? Where do you finish?

3. When are networks traversable?

4. What conjecture can you make about the vertices of a traversable network if you end at the starting point?

5. What conjecture can you make about the vertices a of traversable network if you end at different point from the starting point?

6. which of the following networks can be drawn with one straight line?​