When referring to a megabyte for disk storage, the hard drive manufacturers use the standard that a megabyte is 1,000,000 bytes. This means that when you buy a 250 Gigabyte Hard drive you will get a total of 250,000,000,000 bytes of available storage.
A food chain only follows just one path as animals find food. eg: A hawk eats a snake, which has eaten a frog, which has eaten a grasshopper, which has eaten grass. A food web shows the many different paths plants and animals are connected. eg: A hawk might also eat a mouse, a squirrel, a frog or some other animal.
The transfer of materials and energy in the form of food from one trophic level to another trophic level by the repeated process of eating and being eaten is known as food chain. Three types of the food chain are grazing food chain, parasitic food chain, and detritus food chain. The number of food chains is interconnected to each other forming a network is called food web. Two type of food webs is terrestrial food web and aquatic food web.