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Describe how crude oil is separated into fractions

Crude oil is separated by fractional distillation. Crude oil is heated to vaporize the different hydrocarbons in a tank which is cool at the top and hot at the bottom. The vapours then rise and the different...
PI
Answered by Paul I. • Chemistry tutor
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What are chromosomes?

Chromosomes are thread-like structures that are found in the nucleus of the cell. They contain many genes which are sections of DNA that code for a particular protein. These proteins will give an individual ...
EC
Answered by Emma C. • Biology tutor
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Describe how different environmental factors affect the direction of growth of roots and shoots making reference to plant hormones

Shoots grow upwards towards light and away from gravity, while roots grow downwards towards moisture and with gravity. Plants produce an uneven distribution the hormone auxin causing unequal growth rates of ...
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Answered by Paul I. • Biology tutor
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A person touches a hot pan by accident and their hand automatically moves away. What type of response is this? Describe how the structures involved cause the response. (5 marks)

Reflex action/reflex arc/reflex (allow "involuntary") The stimulus (heat) is detected by temperature receptors in the skin. This causes impulses to travel along a sensory neurone to the spinal cord...
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Answered by Ariel R. • Science tutor
64566 Views

Who are the Olympic gods?

There are 12 Olympic gods, each with their own personality and characteristics. They were worshipped in accordance with these personality traits and often displayed very human characteristics. Zeus - ruler o...
HS
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