Answer:
Explanation:
1. Virus's are hard to detect because of their simple construction.
2. Some mutate very easily.
3. It is hard to isolate the virus and kill it without doing damage to the host.
Answer:
i am pretty sure it is compound
Because going down a column you are jumping up to the next higher main energy level (n) and each energy level is further out from the nucleus
I think it could be C maybeee though
