In the Northern Hemisphere, choose ALL that apply The tilt and revolution of the Earth causes the seasons Summer solstice occurs when the Earth's North Pole is tilted toward the sun. Fall and Spring Equinoxes occur when days and nights are equal in length. Winter solstice occurs when the Earth's North Pole is tilted away from the sun.​

Water has a solvent capacity in wich happens all the metabolic reactions

Carbohydrates are used as a source of quick energy, because it´s used a very small amount of ATP to degrade carbohydrates compare to the lipids that need more ATP to be degraded.   In addition to that, the carbohydrates are easly found in nature, easier than lipids.  They are at the base of the trophic chain, present in the plant, fruits and vegetables.