Question

Your classmate asks your teacher why viruses are so hard to define. Her response would likely be:

"Scientists from all over the world study them and can't agree on the same definition."

"New viruses that don't fit our definitions are discovered all the time."

"Viruses are good for humans, and others are harmful."

"Some viruses are good for humans, and others are harmful."

Answer 1

"New viruses that don't fit our definitions are discovered all the time."

Answer 2

"Some viruses are good for humans, and others are harmful."

Step-by-step explanation:

"Some viruses are good for humans, and others are harmful."