How was the first periodic table of the elements organized?
A. in alphabetical order by element name
B. by atomic number of the atoms that make up each element
C. by average atomic mass of the atoms that make up each element
D. by average number of neutrons in the atoms that make up each element

scientific laws are the result of testing theories and proving them to be facts.

measuring things 1 litre of water

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it