primitive and non primitive

Features of Protozoans - Amoeba is a typical protozoa..

Locomotion with the help of finger-like projections called pseudopodia, cilia or flagell..

Unicellular (single celled) animals.Nutrition is heterotropi..

Primitive multicellular animals with cellular grade of organisation. Free living aquatic, mostly marine, sedentary forms either solitary or colonia..

Chemical evolution resulted in the formation of life on earth about 3.8 billion years ago. The primitive cells that resulted from this process gradually gave rise to primitive forms of organisms such as bacteria, algae, fungi and protozoan. These organisms in turn, gave ri..

As the theory of chemical evolution started gaining more support, investigations were initiated by several scientists to establish the conditions under which, the simplest organic compounds were formed in the primitive earth. Two scientists, Stanley Miller and Harold Urey were the f..

The equation y = mx has one arbitrary constant and its differential equation is of order 1. The equation y = mx + c has two arbitrary constants and its differential equation is of order 2. In general, if an equation contains n arbitrary constants, then we obtain its differential equation which is ..

There are two types of cell division in eukaryotes namely Mitosis , the equational division and Meiosis ,the reductional division. There is another type of cell division seen in primitive organisms, called amitosis. It is a simple type of cell division in which the nucleus just elongates ..

The division Pteridophyta includes a group of primitive vascular plants, commonly called pteridophytes. The adult plant body in these plants is a sporophyte. It shows differentiation into true roots, stem and leaves. The stem is mostly herbaceous. Leaves may be smaller or larger. Va..

They evolved 3300 to 3500 million years ago. They were like present day cyanobacteria and could release O 2 into the atmosphere because they used water as the reagent. Thus, the whole reducing atmosphere changed to an oxidising atmosphere. Autotrophs are said to have arisen much later in the ..