Question

is/are. How many white mice. there in your laboratory​

Answer 1

Explanation:

Now, for the first time, someone has attempted to calculate this number using data from U.S. labs, and it's big: More than 111 million mice and rats are used annually in U.S. biomedical research, according to a new study. That represents more than 99% of all lab animals.

Answer 2

Answer:

are

Explanation:

how many white mice are their