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Chromosomes can be either single armed or double armed. When a cell is about to divide, a chromosome replicates its genetic material to become a double armed chromosome. A double armed chromosome has a centr...

Granules of plastic powder are poured or fed into a hopper which stores it until it is needed. A heater heats up the tube and when it reaches a high temperature a screw thread starts turning. A motor turns a...

-Large surface area to volume ratio: the lungs contain millions of microscopic air sacs called alveoli, which are the sites of gas exchange in the lungs. The large number of alveoli means that the lungs have...

Before starting anything read the poem through twice. The first time read it just to understand meaning and get a grasp of what the author might be trying to say. The second time read the poem and highlight ...

The relative atomic mass (A r ) is calculated from 2 things : mass numbers of its isotopes and abundance of these isotopes.Let's use Chlorine as an example. Chlorine naturally exists as two isotopes, (chlori...