Red blood cells are able to maintain homeostasis because they are bathed in blood, which is to the fluid in the cells themselves.

Red blood cells are able to maintain homeostasis because they are bathed in blood, which is isotonic to the fluid in the cells themselves.
A solution is said to be isotonic when its effective osmole concentration is the same as that of another solution.

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