What is the difference in the meaning between the lengths of lines in a phylogram and ultrametric tree?

A phylogram is a phylogenetic tree where edge lengths signify time or genetic distance while an ultrametric tree or “chronogram” is a phylogenetic tree where edge lengths represent time. Also in an ultrametric tree, all tips of the tree are equidistant from the root of the tree. While a phylogram has dissimilar branch lengths which quantitatively signify the opposing degrees of change between the root and each terminal node.

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answer: the correct answer id option(d).

explanation:

snell's law refraction:

the angle of refraction =

the angle of incidence =

refractive index of air = = 1

refractive index of glycerol = 1.47

from the given options, the most closest answer to 63.72° is 65° of option (d).