The development of the cell theory involved
a. different ideas from different scientists.
b. the efforts of one scientist.
c. work with computer models.
d. complete agreement among scientists.

Many body systems work together for proper functioning of the body and to maintain internal homeostasis. the works to break down food eaten before exercising. the takes in the nutrients obtained from the food. the body sweats as a mechanism to cool off, because the is working to flush out toxins.