the famous scientist albert einstein sometimes used "thought experiments" such as imagining himself chasing a beam of light or riding in an elevator in free-fall. these thought experiments, which would not be possible to conduct physically, helped him challenge current specific thinking and develop his the worked of gravity and of special relativity

Deer cave cannot support photosynthesis is as not enough sunlight is present. in spite of this, it still has a complex food chain. what is the energy foundation of this food chain?

The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.

During convection, less dense fluid rises and denser fluid sinks.