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How is crude oil separated into fractions?

Crude oil is seperated using a method called fractional distillation. The hydrocarbons that make up crude oil have different boiling points, so when the crude oil is heated, each compound evaporates at a dif...
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Answered by Devna P. • Chemistry tutor
14245 Views

what is the difference between indefinite and definite particles?

The definite particle in arabic includes the letters 'alif' and 'laam' at the beginning of the word, so pronounced as 'al'. The purpose is to render the noun on which it is pre-fixed to. Consequantly, it is ...
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Answered by Zainab I. • Arabic tutor
9602 Views

What is the difference between a recessive and dominant allele?

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 for brown eyes or a...
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Answered by Elisha J. • Biology tutor
14616 Views

How does writing reflect the audiences and purposes for which it was intended ?

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. Sorry x" 2) To persuade: &quo...
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5708 Views

How could species have evolved from an ancestor such as Archaeopteryx?

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 produ...
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Answered by Heather J. • Biology tutor
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