Which of the following is true about the speed of light? (2 points) Group of answer choices It is a constant when the light is traveling in a vacuum. It speeds up or slows down depending on the observer. It is slowest in a vacuum. It varies depending on the color of the light.

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.

Carbon dioxide because it consists of one type of molecule.

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