Abotanist is measuring plants to determine amount of growth after fertilizer was used. a ruler was used for the measurements. which type of measurement is being collected?

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.

i'm pretty sure it is letter c.) car