Aplastic cube with a coin taped to its top surface is floating partially submerged in water. a student marks the level of the water on the cube, and then removes the coin and tapes it to the bottom of the cube. afterward, the student returns the cube to the water. a. above the water lineb. below the water linec. level with water line

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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.

An em wave does not require a medium, while a mechanical wave does. 

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