Recapitulation is a bold and influential idea that is particularly associated with Ernst Haeckel though many other biologists also supported it in the nineteenth and early twentieth centuries. According to the theory of recapitulation, the stages of an organism’s development correspond to the species’ phylogenetic history- in a phrase, “ontogeny recapitulates phylogeny.” Each stage in development corresponds to (that is, [...]
We have alluded to their role in the decay of organic matter, and we shall expand the idea by briefly examining the place of microorganisms in three vital cycles of nature: 1. The carbon, 2. Sulfur, and 3. Nitrogen cycles. 1. Carbon Cycle: The earth is composed of numerous elements, among which is a defined amount of carbon that must [...]
Here is a list of some essays on disease causing bacteria in humans. Also learn about about its prevention and control. Essay # 1. Diplococcus: The pneumococcus (Diplococcus pneumoniae) is the causative agent of lobar pneumonia. The disease is nearly always caused by this organism, although other bacteria are occasionally involved. Diplococcus Pneumonia: Cells oval or spherical, measuring 0.5 to [...]