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List two reasons drugs to treat illness are often trialled

Accept any two from: Toxicity Dosage Efficacy side effects
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Answered by Charlotte B. • Biology tutor
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The Polar Bear is the largest species of bear in the world. With regards to adaptation, suggest a reason for this.

The habitat of the Polar Bears is the arctic. This is a much colder climate than the other species of bear found in the wild. Therefore the Polar Bear has adapted to live in this colder climate. One adaptati...
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Answered by Zia F. • Biology tutor
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Describe and explain what is meant by ‘natural selection’. (4 marks)

Natural selection is a theory devised by Charles Dickens. Due to the existent of alleles and genetic variation, some organisms will be better adapted for survival in their given habitat. As a result of this ...
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Answered by Charlotte G. • Biology tutor
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Describe and explain the adaptations of the alveoli for gas exchange. (4 marks)

The alveoli are highly folded in order to increase the surface area available for gas exchange. The thins walls of the alveoli and the supplying capillaries allow for a short diffusion distance, thus increas...
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Answered by Charlotte G. • Biology tutor
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What are the main differences between meiosis and mitosis?

Both mitosis and meiosis are processes of dividing a diploid cell, however there are a number of key differences. Mitosis results in two genetically identical, diploid, daughter cells and takes place during ...
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Answered by Kara E. • Biology tutor
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