Question

some animals sleep many more or many fewer hours per day than humans do. for example, bats sleep about ____ hours per day, whereas cows sleep only ____ hours per day.
12; 4
12; 2
20; 2
20; 4

Explanation:

Bats are known to sleep for a large number of hours daily, around 20 hours. Cows sleep for a relatively fewer number of hours, about 4 hours per day.

Answer:

D. 20; 4