This chart shows a portion of a dichotomous key.
dichotomous key
which relationship can be determined from this dichotomous key?
organism x and organism z have at least one observable trait in common.
organism y has at least one observable trait in common with organisms x or z.
organism x is in a different phylum than organism y.
organism z is genetically closer to organism x than to organism y.

Answer;

Organism Y has at least one observable trait in common with organisms X or Z.

Explanation;A dichotomous key is a biological tool that is used by scientists to identify unknown organisms. It is used to identify organisms in an ecosystem such as trees, mammals, fish, etc. Dichotomous key consist of a series of steps that leads to the correct name of a given organism. In the part of dichotomous key below, it is evident that organism Y has at least one observable trait in common with organisms X or Z. That is; the trait in number one is common to organisms X, Y and Z, while Trait 3 is common to organisms X and Z.

Ichoose a as my answer

The answer is a: the eggs have half as many chromosomes as the body cells