Was the Chicken or the Egg First? - Scientists Unravel Age-Old Mystery with 80 Species Study
They studied a total of 51 fossil and 29 living species that were either egg-laying or viviparous (give birth to live young).
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Study finds pregnant fish get ‘baby brain’ too
While most fish reproduce by laying eggs, some species are live-bearing, or viviparous, and carry their offspring internally before producing live young. Viviparous species include popular ...