Which step is shown?

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All ova contain sex chromosomes corresponding to: x y xx xy

In a lab, scientists grew several generations of offspring of a plant using the method shown. what conclusion can you make about the offspring? a. they formed from meiosis and mitosis. b. they have half the number of chromosomes as their parent. c. they have low genetic variability among them. d. they will be able to reproduce only after they grow flowers.

Everything in the universe originated from a single point. how was it possible for everything in the universe to have occupied a single point in space?