If elite marathoners run at an exercise intensity that does not cause appreciable accumulation of blood lactate, why do some athletes appear disoriented and fatigued and forced to slow down towards the end of the 26.2-mile competition

Match the digestive enzymes to the macromolecules they to digest. break down fats into glycerol and fatty acids break down carbohydrates into simple sugars break down nucleic acids into nitrogenous bases and simple sugars break down proteins into amino acids

Iguanas need to live in a habitat that is very warm, so the pet store warms their enclosures with "basking lights" which act as an artificial sun. describe how the three methods of thermal energy transfer may take place within the iguana's enclosure.

Long term exposure to waves can cause sunburns and skin cancer.