Select the correct answer.
which particles make up the nucleus of an atom?
a.
protons and electrons
b.
neutrons and electrons
c.
protons only
d.
protons and neutrons
e.
neutrons only

Which answer tells the reason the earth’s climate is getting warmer? too many animals are becoming extinct. large glaciers are melting in antarctica. the earth is moving closer to the sun. driving cars gives off gases that trap heat in the atmosphere.