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But most organisms are not internally fertilized mammals with wildly complicated systems of internalized embryonic care.Most species lay a pile of eggs that a male squirts sperm on or squirt eggs while the male squirt sperm and then they hope for the best.

Makes me wonder how much this has been researched in true hermaprhodites.I don't have a reference, but I was thinking all multicellular life and I'd have to imagine that when you factor in plants, that external fertilization is relatively the norm (as is hermaphrodism (dioecy) for the plants).As to earthworms, I disagree about your description of them.sort of like asking 'why do we bother getting married and buying houses when we could just hook up at a bar every weekend?' hermaphrodites can reproduce more easily, but other organisms invest more in their offspring and also often have a harder time getting around to mating. It is perhaps easiest to address the question by countering it and asking why dioecy (2 sex systems/2 gonochoric types e.g. As you have pointed out there are obvious advantages to being a hermaphroditic species such as more chance of mating - more likely to provide an advantage at very low population densities where interactions are infrequent.

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