There wasn’t an identifiable first apple or orange seed. They would have evolved from some preceding plant species slowly over time. So over thousands of generations the preceding plant becomes more and more like an apple or orange tree until eventually it matches what we would recognize as an apple or orange tree but there wasn’t a single point where you could say one generation wasn’t an apple or orange tree and the next was. Think of it like a person aging. Any given day they won’t look any different than the day before but look at two pictures taken 20 years apart and you will see how they aged.
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