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The answer is letter B.


There are 2 embryonic and adult tissues found
in jellyfishes, hydras, and sea anemones. This is caused by the formation of a
germ layer—a group of cells in the embryo that interact with each other while
forming all organs and tissues. Germ layers develop through the process of
gastrulation in the early embryonic life. The three organisms mentioned have
two primary germ layers which gives them a radial symmetric structure
classifying them as Dipoblastic organisms.