structures that have no current function

Respiratory System in Human Beings The respiratory system starts with the nose that encloses the nasal cavity. The nasal cavity opens to the outside through the openings called the nostrils. The nasal cavity is divided into two portions by a cartilagenous septum and is lined by fine hairs that..

. When the ventricles pump blood into the blood vessels, the bicuspid and tricuspid valves prevent the backflow into the auricles. Know Something The function of the heart is to pump blood into the blood vessels to ensure that blood reaches all the parts of the body. This is done by the c..

The characteristic structure of an ecosystem is obtained by the systematic physical organisation of the abiotic and biotic components of that particular ecosystem. The two main structural features of any ecosystem are its 'species composition' and 'stratification'. An ecosystem ..

Structure of Functional Groups - In alcohol, the oxygen of the -OH group is attached to sp 3 hybridized carbon by a sigma ( s ) bond formed by the overlap of sp 3 hybrid orbital of carbon with an sp 3 hybrid orbital of oxygen. in alcohols is slightly less than the tetrahedral an..

Summary - The biotic and abiotic components form an interacting system called 'ecosystem'. Producers, consumers and decomposers are the various trophic levels, which are linked by their food relationship forming a 'food chain'. Several food chains are interrelated and interconnected to form a netwo..

In alcohol, the oxygen of the -OH group is attached to sp 3 hybridized carbon by a sigma ( s ) bond formed by the overlap of sp 3 hybrid orbital of carbon with an sp 3 hybrid orbital of oxyge..

Introduction - Biogeography reveals that living organisms (plants and animals) are found practically everywhere on this earth. The living components interact among themselves as well as with their physical environment like soil, air and wate..

Man has a pair of ears that function as the organs of hearing and the organs for equilibrium. It has two different structures for each of these functions. Both these structures have receptors that convert the vibrations into nervous impulses that are transmit..

Man has a pair of ears that function as the organs of hearing and the organs for equilibrium. It has two different structures for each of these functions. Both these structures have receptors that convert the vibrations into nervous impulses that are tr..

There appear to be many structures that are similar because of the function they carry out and in their external appearance. However, these structures differ internally. Such structures are called analogous structures. For example, wings of bat and..