1. a 2. b 3. d 4.c 5. b 6. a 7.d
Answer:
A.
Explanation:
To find out if a call of an animal is missing.
It would be A. because the selection said, "The more scientist's listen to these kind of recordings, the more they notice when expected call are missing".
I believe it is B isn't, because if you use the others it most likely sounds like slang.
Answer:
A dog is a animal and it is also one kind of best friend of people.
