The human circulatory system is composed of a network of arteries, veins, and lymphatic vessels
that carry blood and lymph throughout the body.
An essential task by which the circulatory system
helps the body maintain homeostasis is
A. distributing white blood cells that attack disease
across different organs.
B. destroying harmful toxins.
C. breaking down inorganic substances that can be
used by different organs.
D. causing the growth of muscles.

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt