Answer: False
Explanation: This is FALSE because the bats make a high frequency sound and we can't hear that type of sound.
I believe that it is D. All of the above.
<em>If this is incorrect, please, do tell me and I can fix my mistake. Thank you.</em>
the answer is B: so it isa line
The accumulation of several mutations in the main gene on the virus's surface may be able to give H7N9 the ability to spread like human flu viruses do, passing from person to person through coughing and sneezing.
