Answer:
animals who eat the bark can spread it.
Explanation:
logic
Dust in the air because the water molecules need something to condense around.
Plant! The membrane controls what goes into and out of the cells.
If you have 20% of contracting the disease it wouldn’t be that dramatic but if you have 50% it’s pretty bad I think you won’t be able to see the person with 20 only 50 would have symptoms