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How does Natural Selection occur?

In the population of a species there will always be a selection pressure (new predator/competitor/ presence of disease) There is genetic variation within the population so new alleles can arise due to ran...

Answered by Biology tutor
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Why does the first ionisation energy of atoms generally increase across a period?

The first ionisation energy is defined as the energy required to remove one mole of electrons from each atom of a mole of gaseous atoms. As we go along a period in the periodic table, the atomic number in...

Answered by Chemistry tutor
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How does DNA replication work?

DNA replication is called semi-conservative, because each original strand is used to create a new strand. In order to do this, first we need to separate the two strands: they are unwound and unzipped by t...

ET
Answered by Ellie T. Biology tutor
3963 Views

Express as a single logarithm 2 loga 6 loga 3 [2 marks]

loga12
explantion:from simples rules of logs

Answered by Maths tutor
8484 Views

the moon takes 27.3 days (2.36x10^6s) to orbit the earth . Calculate its distance from the earth . Take the mass of the earth to be 5.975x10^24kg.

Use the set formula T2=(4Pi^2/GM)R^3 and rearrange for r^3 to give
r3= T2GM/ 4Pi2
then insert values : r3 = (2.36x106)2

Answered by Physics tutor
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