It should be oxygen because plants take in carbon dioxide, sunlight, and water and get rid of oxygen, energy, and water. (see pic)
The slow rate at which diffusion occurs over large distances.
Dynamic equilibrium also known as Homeostasis is responsible for these fluctuations. Hope it helped!
Looks like a kidney to me or really close up skin not sure tbh
It is always beneficial to study the diseases of other animals because many of these diseases can be transmitted to humans as well. It's also essential in order to save the lives of dogs.