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Sex started with fish at least 385 million years ago

Sex was happening on Earth at least 35 million years earlier than we previously knew, according to a new study. Even though fish generally reproduce externally by releasing eggs and sperm outside the body, a group of researchers back in 2009 found that at least one type of fish had started using internal fertilization about 350 million years ago. That same group of researchers, led by John Long of Flinders University, has now found a different species that they say was having sex as early as 385 million years ago, presenting what’s now the earliest-known example of an animal that reproduced through internal fertilization. The findings are described in a study published in Nature.

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