The locomotor system includes which two systems?

It includes the skeletal system and the muscular system.

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the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence