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A mass extinction is a large decrease in the number of species over a relatively short period of time (several millions of years). The most likely cause of this species decline is the formation of the superc...

The term ' ethnocentric ' describes an attitude or policy that gives priority to the culture and viewpoint of one particular ethnic group, while disregarding others. The culture that dominates is adopted by ...

92A human has 46 chromosome (23 pairs). After the genetic material is duplicated and condenses in Prophase, there are still 46 chromosomes but they exist in an X-shape, where two sister-chromatids are attach...

To differentiate we must use implicit differentiation. So: siny=x .Differentiating both sides we get (dy/dx)cosy=1, so (dy/dx)=1/cosy . Using the common identity (sin 2 (y)+cos 2 (y)=1) we can rewrite the de...

Because the plane of the C=O bond in an aldehyde is flat, and so the nucleophilic attack of CN - onto the C can occur above or below the plane of the molecule, producing two different stereoisomers of a 2-hy...