Describing organisms or embryos that develop with only two primary germ layers (ectoderm and endoderm), lacking the mesoderm layer.
From Greek 'diplos' (double) and 'blastikos' (relating to embryonic development), describing the two-layered nature of certain organisms.
Jellyfish and sea anemones are diploblastic—they evolved to need only two tissue layers, which is why they're simpler than us triploblastic humans who need three layers.
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