Hi there!
Biotic means that something is living, and abiotic means something isn't alive. Paper, since it came from trees, a living thing, is a biotic factor.
Hope this helps!
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Shivering occurs when the core temperature of the body begins to decrease which would threaten normal body function. Shivering is a response by the body to bring back temperature back to homeostasis. Trembling is the continual involuntary contraction of muscles. Muscle activity releases heat that warms up the body. This is the reason why we sweat during physical activities as the body sheds excess heat generated by the muscles in order to maintain the homeostatic body temperatures of 37 degrees centigrade.
The immune system helps neutralize disease and infection. The digestive system processes nutrients from food. The skeletal system includes your bones and supports and protects your body. The correct answer is the nervous system.