Third, magnetism in rocks can be used to estimate the age of a fossil site. This method uses the orientation of the Earth's magnetic field, which has changed through time, to determine ages for fossils and rocks.
Some animals, particularly ruminants and termites, can digest cellulose with the help of symbiotic micro-organisms that live in their guts, such as Trichonympha. In humans, cellulose acts as a hydrophilic bulking agent for feces and is often referred to as a  dietary fiber .
Definition. Glucose and other carbohydrates are the major sources of energy for the human body. When we consume sugars and carbs, we are increasing the available energy molecules that can be utilized for cellular respiration and adenosine triphosphate (ATP) production.arbohydrates are an important energy source for the human body. Yet, when we consume too much of this fuel, we have to have a way to store the excess. This article discusses glycogen, the storage form of sugars for energy production.