"Based on the cladogram, which trait is symplesiomorphy for Aves?"
He peered through the eyepiece. At first only a familiar world—red blood cells, squamous sheets—resolved. Then something impossible: a tiny translucent city, a lattice of cilia and bridges, streets lit by pulsing mitochondria, inhabitants clothed in membranes and moving with determined purpose. He blinked; the image stayed. The microscope did not magnify things; it revealed them. singapore biology olympiad past papers
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Singapore Biology Olympiad (SBO) Singapore Junior Biology Olympiad (SJBO) "Based on the cladogram