Page 16 - 新思维科学活动用书6 样章
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1.3 The reproductive system
c How many girls started puberty at the age of:
i 10?
ii 14?
d The scientist also measured the mass of the girls at the start of puberty. This is a
summary of her results.
Age in years Average mass in kg
9 45
10 45
11 46
12 46
13 47
14 46
15 45
i What pattern can you see in the results?
ii Suggest a factor that affects the age at which puberty starts.
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