Astronauts on a distant planet set up a simple pendulum of length 1.3 m. The pendulum executes simple harmonic motion and makes 100 complete oscillations in 238 s. What is the magnitude of the acceleration due to gravity on this planet

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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