Scientific cross-section illustration of red reef coral (Acropora) polyp revealing intricate six-fold symmetry with microscopic tentacle arrangement, zooxanthellae algae symbiont distribution in soft tissue, and calcium carbonate skeleton architecture on aged cream paper, handwritten Latin annotations describing each anthozoan adaptation and reef-building mechanism, measurement scale in centimeters along the edge, soft marine biology laboratory spotlight from upper left casting delicate shadows, museum archive quality, Pantone-accurate vivid coral-pink polyp exterior with cream skeletal highlights and pale gold tentacle tips, composition dynamically centered to showcase the coral's 50-million-year-old scleractinian evolution elegance, mood: zoantharian precision capturing reef-building wonder, hyperrealistic details of skeleton porosity and tentacle nematocyst texture visible