Which of the following factors would have the smallest impact on a population’s size?
a. the total number of organisms
b. the available water supply
c. the variety of organisms
d. adequate shelter

The correct answer is C. the variety of organisms. Although it may have an impact on a population's size, it is so small that it is almost negligible. However, the total number of organisms, available water, and adequate shelter do have a huge impact on the size of population because these can lead a population to thrive or to die out.

This is what i did 45-5=4040÷4=10so there are 10 white marbles but am not sure is just a question that am not sure

The right answer is b hydrogen bonds!