animal phyla vary greatly in morphology, from simple sponges that
lack tissues and symmetry to complex vertebrates. members of
different animal phyla have similar developmental genes, but the
number of mirnas varies considerably. the following scientific data
was acquired for various animal phyla and tabulated with each
observation (i) as shown in the figure below. in the analysis, mirna
diversity is represented by the average number of mirnas in a
phylum (x), while morphological complexity is represented by the
average number of cell types (y).