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Why is it important to control body temperature?

Controlling body temperature is important due to multiple reasons. Firstly, it is important to maintain the temprature at which enzymes work optimally. Secondly, it allows for the chemical reactions in the b...
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Answered by Adriana N. • Biology tutor
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How is the circulatory system is adapted to give oxygen to the tissues and remove waste products?

The circulatory system is described as being "dual", which means that blood passes through the heart twice for each complete circuit of the body, once to the lungs, and once to the rest o fthe body...
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Answered by Andrew P. • Biology tutor
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Charles Darwin found that finches from different islands had different sized beaks. Explain why one island may have finches with large short beaks and another may have finches with long thin beaks.

The differences in the birds' beaks are due to evolution and natural selection. One island may have an abundance of seeds and nuts which require a large beak to crack them open, meaning that birds with a phe...
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Answered by Poppy B. • Biology tutor
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Explain how allopatric speciation can lead to the formation of 2 species from an ancestral species?

The ancestral species is split into two populations by a geographic barrier, which prevents gene flow. Mutations arise which causes genetic variation between the populations. There are different environmenta...
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Answered by Seb H. • Biology tutor
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Outline the main differences between an artery and a vein? (6 marks)

An artery carries blood away from the heart. The blood is oxygenated with the exception of the pulmonary and umbilical artery. The vessel must cope with high pressure demands and therefore has thick, elastic...
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Answered by Katy B. • Biology tutor
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