Which of the following describes tight junctions? a. junctions among epithelial cells lining the digestive tract b. junctions within electrically excitable tissues, such as the heart and smooth muscle cell c. junctions in areas that are subjected to great mechanical stress, such as the skin and heart muscles d. junctions where cells are held together by cadherins

a) Junctions among epithelial cells lining the digestive tract

Explanation: Tight junctions provide an intercellular barrier between epithelial cells within the gastrointestinal tract and liver and, by reducing the movement of water and solutes through the intercellular space, thereby maintaining separation of tissue compartments.

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a