Đáp án phần 3
But rather, as particular traits came about from …(15)…selective pressures such as choosing wolves who are not …(16)…afraid of humans or ones that were less aggressive. Over many generations we can see big genetic and behavioural trait …(17)…differences. So where does this leave us? We left with two scenarios.
Some early egg laying species gradually lead to the …(18)…creation of the proto-chicken which laid proto-chicken eggs. In one of these eggs, there was a mutation causing a slight change and selective advantage and this was ultimately the first chicken which then went on to …(19)…lay chicken eggs. In this case, the chicken technically came first. Or we have a proto-chicken which gave …(20)…birth to a chicken inside of what we would classify as a chicken egg, and, as such, the egg came first.
Which brings us back to the nomenclature in question of what is a chicken egg? Which is a fairly meaningless question, but, at the end of the day, what we can all …(21)…agree on is that regardless of whether it was a chicken egg or a proto-chicken egg, the first true chicken came from an egg. The egg came first.
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