Once the body has begun shivering, what happens to make it stop shivering? a) when body temperature returns to normal, the respiratory system sends a message to the skeletal system to stop shivering. b) when body temperature returns to normal, the nervous system sends a message to the muscular system to stop shivering. c) when body temperature is below normal, the nervous system sends a message to the skeletal system to stop shivering. d) when body temperature is below normal, the respiratory system sends a message to the muscular system to stop shivering.

The answer is B).
One hint is that, if a message is being sent, the "sender" is probably the nervous systems. There are several subsystems to the nervous system, but it regulates and controls virtually all bodily functions. The nervous system monitors your body's temperature, and takes actions to regulate it, such as telling your muscular system to shiver to generate more heat. It sends this message to the muscular system because your muscles cause bodily movement, such as walking, lifting weights, and even shivering. 

When your nervous system determines that your body temperature has returned to normal, it again sends a message to your muscular system to stop shivering. 
Answer is B

B is the correct answer

Hunting in the darksome fish rely on senses beyond sight. in the darkness of the marianas trench, a fish called the rattail has an extremely sensitive sense of smell. the fish uses scent, rather than sight, to steer toward food. once it's near food, the rattail uses a special organ on the bottom of its chin to guide itself by feel.marine snowone staple of the deep sea diet is "marine snow," flakes of organic, edible substances that sink down from the upper ocean. animals at the ocean's bottom find sustenance in everything from the bodies of dead creatures to fecal matter. marine snow is diverse enough to support numerous species. for instance, several species of snails and worms feed exclusively on deceased whales.microorganismsthe deep sea is an intricate ecosystem, and even the ocean floor itself plays a part. hydrothermal vents are cracks in the sea floor where erupting magma mixes with ocean water to produce plumes of hot, sulfur-rich chemicals. some microbes can use these chemicals for energy, sustaining their existence and that of the animals who depend on their roles in the deep sea food chain.

Gay-lussac's law i think.