As per the United Nations, when will the world's population reach 9 billion people? ΟΑ. .
2025
B.
2050
OC.
2020
D.
2055

the reason is because the moon has some form of gravity, and that gravity pulls the ocean tides.

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

i don't understand. explain it clearly