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What is the evidence for the Big Bang theory?

Absorption spectra from distant galaxies consist of bands of coloured light crossed with black lines. The wavelengths of these black lines are shifted towards the red end of the spectrum when compared wit...

AM
Answered by Aled M. • Physics tutor
5993 Views

Describe the differences in Structure and properties of diamond and graphite

Both of these compounds are made purely of carbon. The differences come in the way in which the atoms are bonded together and the properties that this creates.In diamond, each atom is covalently bonded to...

PP
Answered by Phoebe P. • Chemistry tutor
4145 Views

How do we control the concentration of urine?

Osmoregulation is the homeostasis of water in the body. It is important that water volumes are kept relatively constant as this influences electrolyte concentrations and cell activity.

AB
Answered by Adam B. • Biology tutor
2812 Views

What are the elements of a criminal offence?

When deciding whether or not someone is guilty of a criminal offence, the Court will look for three elements: actus reus or a 'guilty act', mens rea or a 'guilty mind', and novus act...

DE
Answered by Dominic E. • Law tutor
15313 Views

Multiply and simplify the following: (x-8)^2

With these questions, I always think how to write out the expression in terms that are more simple to understand:
I would write out the expression as '(x-8)(x-8)' which really shows what the power of...

MS
Answered by Myles S. • Maths tutor
12206 Views

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