Mendeleev organized the chemical elements based on their properties.
Mendeleev put elements in order in the periodic table according to their physical and chemical properties. He noticed that properties of elements were related to their atomic mass in a 'periodic' way, so he groups of elements with similar properties into vertical columns in the table. His periodic table had initial 63 elements which then expanded to 108 or 109 elements.
Question 1 is false and question 2 is A
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A:The survivors were likely from the black areas of the map, but had the most advantageous genes of those collected.
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Answer:The sun heats earth's atmosphere unevenly. this causes convection currents to move in large circles in the atmosphere.
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