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The study of mathematics as a "demonstrative discipline" begins in the 6th century BC with the Pythagoreans, who coined the term "mathematics" from the ancient Greek μάθημα (mathema), meaning "subject of instruction".[4] Greek mathematics greatly refined the methods (especially through the introduction of deductive reasoning and mathematical rigor in proofs) and expanded the subject matter of mathematics.[5] Although they made virtually no contributions to theoretical mathematics, the ancient Romans used applied mathematics in surveying, structural engineering, mechanical engineering, bookkeeping, creation of lunar and solar calendars, and even arts and crafts.
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Sea stars can push their stomachs outside of their body and insert it into its prey allowing them to digest the food externally. This ability allows sea stars to hunt prey that are much larger than its mouth would otherwise allow.
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Atmospheric oxygen is too reactive
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cell wall,vacoule,and plastids are not present