How old is it? Rock layers, rock clocks, amber and the long story of life

The 15 questions of lesson 276 «How old is it? Rock layers, rock clocks, amber and the long story of life» of the biology course of Mova's primary school with their options, 80 sentences, every one parsed by Mova with its syntax tree and pragmatics. How the student did on them: the lesson at school.

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