Samuel throws a ball into the air 20 meters. It reaches the top of its flight at 2 seconds and hits the ground at 4 seconds. What was the ball's average speed on the
way down?

How is it possible that phylogenies based on sequences from nuclear genomes and organellar genomes (i.e., chloroplasts and mitochondria) from the same group of species yield phylogenetic trees with different branching orders?   answer :   the genome of the endosymbiont is more closely related to members of the group in which it originally evolved, while the nuclear genome of the engulfing organism has its own evolutionary trajectory.

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