External Vs Internal Fertilization - Deepstash

External Vs Internal Fertilization

  • If fertilization is external, neither mother nor father is automatically committed to anything further, and both are theoretically free to seek another partner with whom to produce more fertilized embryos.
  • Yes, their just-fertilized embryos may need some care, but mother and father are equally able to try to bluff the other into providing that care.
  • But if fertilization is internal, the female is now pregnant and committed to nourishing the fertilized embryos until birth or laying.
  • If she is a mammal, she is committed for even longer, through the period of lactation.

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prince_rahul

The more one seeks to rise into height and light, the more vigorously do ones roots struggle earthward, downward, into the dark, the deep — into evil.

To us humans, the sex lives of animals seem weird. But it's our own sex lives that are truly bizarre. Stranger yet, we have sex at any time, even during periods of infertility, such as pregnancy or post-menopause. Why does the human female, virtually alone among mammals, go through menopause? Why does the human male stand out as one of the few mammals to stay with the female he impregnates, to help raise the children that he sired? Why is the human penis so unnecessarily large?

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