Respuesta :

1. They are formed by Meiosis.
2. Relatively constant environmental conditions. 
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Reproduction Practice Answers 
1) D- Meiosis
2) A- Relatively constant environmental conditions 
3) D- Mammals
4) B- Marsupials
5) D- Monotremes secrete milk through pores on the surface of the mother's abdomen 
 
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