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Explain Darwin’s theory of evolution by natural selection.

In an animal population most organisms produce more offspring than can survive to adulthood. For this reason, there is competition with each other for resources, such as food, shelter and mates, in order to ...
SP
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Explain why damaged villi may result in poor growth (4 marks)

(mark 1) damaged villi reduce the surface area for villi (mark 2) meaning fewer amino acids and glucose are absorbed (mark 3) less glucose present means there is less energy transferred in respiration (mark ...
JA
Answered by Jemima A. • Biology tutor
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Explain how the body responds to increases and decrease in blood glucose concentration:

When the concentration of glucose in the blood increases, insulin (a hormone) is secreted by the pancreas. It binds to cells, stimulating them to increase their uptake of glucose, hence decreasing the amount...
MS
Answered by Mikhela S. • Biology tutor
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What is the process that transports dissolved sugars around a plant?

Translocation
EC
Answered by Eloise C. • Biology tutor
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|The diagram shows part of a DNA molecule. DNA is a polymer. What is the evidence from the diagram that DNA is a polymer?

DNA is a polymer due to the fact it contains multiple repeating units (monomers). These monomers are known as nucleotides. Multiple nucleotides join together by phosphodiester bonds to form the polymer that ...
JF
Answered by James F. • Biology tutor
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