oils
unctuous combustible substances that are liquid or easily liquefiable on warming, and are soluble in ether but insoluble in water. Such substances, depending on their origin, are classified as animal, mineral, or vegetable oils. Depending on their behaviour on heating, they are volatile or fixed.
Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pat..
This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..
This tutorial elaborates on the physical development of humans, particularly from puberty to adulthood. Read this tutori..
Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..
Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..
Plants need to regulate water in order to stay upright and structurally stable. Find out the different evolutionary adap..
