Answer: Amylose in starch is responsible for the formation of a deep blue color in the presence of iodine.
Explanation :The iodine molecule slips inside of the amylose coil.n This makes a linear triiodide ion complex with is soluble that slips into the coil of the starch causing an intense blue-black color.
Answer:
Are you referring to symbiotic relationships between organism? If so, the answer would be parasitism.
One organism, a parasite, takes advantage of another organism at the expense of the host organism.
Ex. A tick bites a dog for blood to use as food. The dog gets an uncomfortable bug bite and the dog might catch a tick borne disease.
I am pretty sure its called the "Biological Soup theory"... I hope I helped!