question: What is formed when the collagen and elastic glycoproteins surrounding eukaryotic cells are calcified ?
answer: shells , bones , and spicules
turker_answer: Shells , bones , and spicules are formed when the collagen and elastic glycoproteins surrounding eukaryotic cells are calcified .
rule-based: Shells , bones , and spicules is formed when the collagen and elastic glycoproteins surrounding eukaryotic cells are calcified .