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Newborn babies can be fed with breast milk or with formula milk. Both types of milk contain carbohydrates, lipids and proteins.• Human breast milk also contains a bile-activated lipase. This enzyme is thought to be inactive in milk but activated by bile in the small intestine of the newborn baby.• Formula milk does not contain a bile-activated lipase.Scientists investigated the benefits of breast milk compared with formula milk.The scientists used kittens (newborn cats) as model organisms in their laboratory investigation.Other than ethical reasons, suggest two reasons why they chose to use cats as modelorganisms.[2 marks]
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