What is the luminosity of a star? A.
the measure of absolute magnitude
B.
the measure of its distance from the Earth
C.
the measure of radius of a star
D.
the measure of total energy output
E.
the measure of its surface temperature

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.

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.