Answer:
I think its because we're not exactly immune to all the diseases, it's called the immune system because the cells defend the body from bad bacteria and it teaches your body to learn to fight against the bacteria from a virus/disease until the body is immune.
Explanation:
The equations shown in the picture describes your situation where (b) is the number of bicycles and (T) is the number of tricycles.
only explain the good qualities and ignore the boring and the weak points and focus on the interesting and the strong points
Answer:
I don't think that is possible. But, if you know a question that the person has been on, look it up on the top, where it says search for a question. Then if that person is there, send them a friend request so you can always reach them.
Hope this helps!!
