Why is it necessary to see a similar pattern of change in fossils from several places in order to conclude that an extinction happened?

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

we need the questions , i may then you.