Answer:
The correct answer is it occurs naturally by diffusion.
Explanation:
Diffusion is one of the most important passive transport mechanism which helps in the movement of small molecules and gases across the plasma membrane down their concentration gradient.
In simple words diffusion deals with the transport of small molecules and gases from the region of high concentration to the low concentration region untill the contration of both the regions become equal.
I would also agree that the answer is insulin
insulin is known as an endocrine hormone. The endocrine glands are what produce hormones. Insulin is a protein that is made by the beta cells , which are found in the pancreas. Beta cells major function is to store and then release insulin.
Hopefully this helped and good luck. If you need me to clarify anything just let me know.
1 example would be weather, we adapt to the weather with being in it.
