3.
which of these are least for constructing phylogenetic trees?
a analogous structures
b. homologous structures
வாலாய
c. embryonic structures.
d. vestigial structures
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I would choose D. vestigial structures

Explanation:

Because when you talk about phylogeny trees you are talking about relationships or differences between organisms that under go change. The organ systems however, in most species do not vary by much. I don't know if I am right, but that would be my guess.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands