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1. What are organs that are in the immune system that are used
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1. What are organs that are in the immune system that are used in different organ systems? 2. Why was disease hard to fight up until recently?

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Which of the following are correct- A. Both DNA and RNA are able to mutate:
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Question 2
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Consider the following statements about animal breeding. Which of the given statements is incorrect?
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  4. Methods of animal breeding are based on selective breeding
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Question 3
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Given below are three statements (A-E) each with one or two blanks. Select the option which correctly fills up the blanks.
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Question Text
1. What are organs that are in the immune system that are used in different organ systems? 2. Why was disease hard to fight up until recently?
TopicAll topics
SubjectBiology
ClassClass 12