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What is a control in an experiment?

A scientific control is an experiment or observation designed to minimize the effects of variables other than the independent variable. This increases the reliability of the results, often through a comparis...
AP
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What is meant by a reducing agent?

A reducing agent is oxidized. This means that it donates electrons to another substance, thus reducing it. Fe2+ to Fe3+ represents oxidation. Fe2+ could be a reducing agent.
JG
Answered by Jools G. • Chemistry tutor
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Describe the changes in the lungs during inspiration

During inspiration, the intercostal muscles contract, moving the sternum up and out. This increases the thoracic volume, hence decreasing the pressure. The pressure gradient set up causes air inflow from out...
DN
Answered by Dhaval N. • Biology tutor
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Outline and Explain the Logical and Evidential Problems of Evil for the Existence of God. (30)

The original Problem of Evil is often attributed to the ancient Greek philosopher EPICURUS (341-270BC). If God can do nothing about the evils in the world, then He is not omnipotent.If He does not see them, ...
MK
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A student has loaded a spring beyond its limit of proportionality. What does this mean?

The limit of proportionality is the is the point beyond which Hooke's law is no longer true when stretching a material.
AP
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