Questions tagged [reproduction]

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20
votes
2answers
4k views

Can a pair of rats multiply to 200 within a year?

A story on the BBC News website makes the following claim: Brown rats are one of the planet's most serious mammalian pests, ruining crops and harbouring disease. Expert jumpers, climbers and ...
14
votes
4answers
2k views

Do we know why animals have evolved to have sex for reproduction?

I've been reading 13 Things That Don't Make Sense: The Most Intriguing Scientific Mysteries of Our Time (2010) and Chapter 10 concentrates on the subject of Sex. The author argues that we do not know ...
6
votes
1answer
460 views

Is it safe for nursing mothers to dye their hair?

My wife has been abstaining from dying her hair during pregnancy. Now the baby is born, I suggested she could use the dye again. She said no. A search online was inconclusive: A pregnant woman at ...