a comparative study of the

Comparative Study - The common features show that an evolutionary process exists and there is a link between the different grou..

The common features show that an evolutionary process exists and there is a link between the different group..

Summary - Gases are different from solids and liquids. They have no definite shape or volume. When pressure is applied, a gas contracts and when pressure is released, the gas expands. Gases can move in all directions and completely diffuse with other gases to form a homogenous mixture. Gases have l..

Comparative morphology involves the study of the external features of organisms. There are three types of evidences that comparative morphology reveals. They ar..

A study of the comparative biochemistry shows that certain similar molecules occur in different groups of animals. This can be compared to the homologous structures. For example, the structure of haemoglobin present in man, chimpanzee, gorilla and gibbon show remarkab..

The comparative anatomical studies of various types of organisms show structural and functional differences and similarities between various species. For example, the basic structure of all the flowers is the same with the whorls of calyx, corolla, androecium and gynoecium. How..

Haeckel (1834-1919) formulated that 'ontogeny recapitulates phylogeny'. This means that the developmental stages that an organism goes through repeat the evolutionary history of the group to which the organism belongs. Stages in Embryological Development Though it does not explain the mechanism of ..

X-Ray Study of Crystals - In a crystalline solid, the constituent particles (atoms, ions or molecules) are arranged in a regular order. An interaction of a particular crystalline solid with X-rays helps in investigating its actual structure. Crystals are found to act as diffraction gratin..

Select each study as being either observational(O) or experimental(E). I. Children's behaviour in a play ground (aggression). II. Violence in children's TV programmes. III. Does fluoride in the water supply decrease the frequency of dental cases in a community compared to a simi..