AP BIOLOGY: Unit 1 Test Essay Qs Flashcards | Quizlet
Ap biology essay 1991 transpiration
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AP Biology - Free Essay Examples and Research Papers
Again, the dates for these events are rather rough, but if the creation of a chloroplast happened once and the creation of sexual reproduction happened once, then sexual reproduction would have needed to come before the chloroplast, as many plants produce sexually. If it turns out that the chloroplast really is 1.6 billion years old, then the current date for sexual reproduction would need to be pushed back, or the “sex was invented once” idea would have to be discarded, and biologists would probably decide that the date of sex appearing would need to be pushed back, even without fossil evidence of it.