I think it is D because your responding to the cold from stimuli and by creating heat to keep your body the average temperature it is homeostasis.
A related or common origin or property of an element in the chemical bond.
Well, biotic factors are living things in an ecosystem such as animals or insects. Abiotic factors are non living things in an ecosystem such as sunlight or temperature. I would say biotic factors would be more harmful since this includes bacteria or other diseases, not many abiotic factors would pose a great threat to the entire human species. Hope this helped.
<span>A protein called ATP synthase.</span>