Which of the following provides the best evidence that organ systems in the human body interact with one another?
A-Shivering in response to sensing of cold environment.
B-Storing waste products for later elimination.
C-Breaking down nutrients from ingested food.
D-Exchanging of gases with the atmosphere

Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?