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Describe and explain the first stages of the life cycle of a star before it reaches the main sequence.

The star begins as a stellar nebulae. This is a dense cloud of gas and dust containing hydrogen and helium. As it is under a large amount of gravitational pressure, this nebula will then collapse under gravi...
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Answered by Laura B. • Physics tutor
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Why can ammonium sulfate be described as a salt?

A salt is an ionic compound which is made up of two groups of oppositely charged ions. The overall compound of a salt compound must have an overall electrical charge of 0. Ammonium sulfate, (NH4)2SO4, can be...
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Answered by Chloe R. • Chemistry tutor
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What is the function of the myelin sheath?

Neurones can either be myelinated - they are sorrounded by a myelin sheath, or unmyelinated - they are not surrounded by a myelin sheath. The myelin sheath is made up of Schwann cells and there are gaps in t...
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Answered by Chloe R. • Biology tutor
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What is the role of ATP in a cell?

Adenosine triphosphate (ATP) is a small molecule that acts as a coenzyme within a cell. The main role of ATP is to provide energy. Below are the ways it provides energy which can described in an exam. 1) A s...
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Answered by Chloe R. • Biology tutor
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What are the main forms of river erosion?

Definition : River erosion is a process through which the riverbed, banks and rocks are worn away. There are 4 key types of river erosion: 1. Attrition This occurs as smaller rocks which are carried along by...
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Answered by Chloe R. • Geography tutor
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