C is the proper answer. They have been reduced by using unleaded gasoline because lead can harm the air and water we breathe, so using less of it will help reduce the pollution being caused by it.
It results from the composition of the cell membrane. The cell membrane consists of a phospholipid bilayer, which have hydrophilic heads and hydrophobic tails. Hope this helps! :)
The shivering reflex is used to maintain the homeostasis. This happens when the core body temperature drops. as the result of the reduce temperature, homeostasis is triggered and warmth is caused by the movements of the muscles around the vital organs. <em />
