Question

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Answer 1

1. B

2. C

3. C

4. hydrogen

lithium

sodium

5. B

6. false

7.

${2n}^{2}$

9. diagram

10. The advantages of sexual reproduction:

produces genetic variation in the offspring.

the species can adapt to new environments due to variation, which gives them a survival advantage.

a disease is less likely to affect all the individuals in a population.

11. DNA is present in our chromosomes and its function is to carry the hereditary information from parents to next generation.

12. true

13. puberty

14. C

15. false

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