One possible explanation for past climate changes is the movement of earth’s major cities from their previous positions.

It is false, there are alot of causes of climate change.

Explanation:

The Earth's climate has been changing for some times now and activities of men has contributed greatly to it.

Some the factors that lead to climate change are;

Too much green houses gases in the atmosphere like methane, carbondioxide. These gases are emitted due to activities of men like industrial plants and fossil fuels. These gases trap solar radiation and make the Earth to be warm.

Volcanic eruptions and tectonic plate which forces the globe to move in different position and contributing to the climate change.

Concentration of carbondioxide in the ocean. Carbondioxide in the ocean does not absorb heat and there by leading to climate change.

Changes in the way the Earth orbit lead to climate change.

nucleus

would be most reasonable answer tbh

the answer is c. it will give up it's valence electron to the other atom.