Can man know anything
for certain?

yes and no

Explanation:

man kind is very advanced but at the same times it's not because we know many things about technology and the human body and animals and many more we have advanced throughout the years and overcame many of things all because of what we know but at the same time man kind has been wrong about many things

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explanation:

answer:

which of these is the best definition of density the amount of space an object takes up the amount of mass in a given space a measure of the force of gravity on an object the sun of all physical properties of a substance