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1. a children has number of The woman .


2. children five had more or The who women .


3. and energy have limited like Organisms resources time .


4. amounts are energy in invested Large of reproduction .


5. birth gave lifespans never of Shorter who women .


6. analysis data historical in researchers The their used .


7. ageing Effects of on reproduction rates women's .


8. could effects favourable have numbers of pregnancies Smaller .


9. a benefit cancer is lower of One risk .


10. a increased mother receives social support The .