The variable would be “X”
The human heart is an organ that pumps blood throughout the body via the circulatory system, supplying oxygen and nutrients to the tissues and removing carbon dioxide and other wastes.
Answer:
yo queiro escribir mi hermano
The time for half the atoms in a radioactive substance to disintegrate
https://www.vocabulary.com/dictionary/half-life
A barometer is used to measure air pressure!
