Question

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In a classic experiment carried out by the biologist Hopkins in the 20th century, 20 young rats were divided into two groups. One group was fed on a diet of pure carbohydrate, lipid and protein; the other was fed the same diet, but with some added milk. The rats were weighed every day. After 18 days the diets of the groups were swapped over.

Why did Hopkins use two sets of rats?

Explain why 20 rats were used, rather than 2.

Suggest why hopkins used young rats rather than older ones?

Answer 1

1. He used two sets of rats so have more than one group to show if there was a constant result across.

2. He used 20 rats again to see if it was a very rare thing across the rats or the results were common.

3. The only thing I can think of on this that would make much sense is the younger rats did't have as much time in their life to get ilnesses and injuries as the younger rats.

Answer 2

3.(Other than that it could be because he wanted to see the result on growth)

Answer 3

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Answer 4

@Dkace Thank you very much for your help! I truly appreciate it! Apologies for the late reply.

Answer 5

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Sure, I'll close it x