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Alleles are different versions of a gene. Every person has two alleles for each gene (one from either parent). For example, the gene which determines eye colour can either have an allele ...

An audience is the group of people the writer is addressing. 

There are 3 main purposes for writing: (examples in text messages)

1) To inform: "not coming over tonight....

When the population of a species is separated, each group is put under different selection pressures due to differing environments. In each population there is genetic variation, and more offspring are...

Aus, bei, mit, nach, seit, von, zu, gegenueber. 

From the equation for speed: Speed = frequency * wavelength 
=> v = 1000 * 0.34 = 340 metres per second