What do we beileve is at the center of the milky way

A) two stars that have collided together
B) a cluster of stars
C) A black hole
D) A collapsed planet

All motion is caused by force? true or false

#20 which type of bond is formed when bases pair in dna? ionic bond covalent bond coordinate bond hydrogen bond

Acertain atom has 22 protons and 19 electrons. this atom loses an electron. the net charge on the atom is now 4+1+01-4-. if this same atom with 22 protons and 19 electrons were to gain 3 electrons, the net charge on the atom would be 3+2+02-3-.