The correct answer is Matter. Anything that takes up space and has mass is called matter. Matter is what makes up all the objects and substances we encounter in the world. From the air we breathe to the solid objects we touch, everything around us is made of matter.

Matter can exist in three main states: solid, liquid, and gas. In solids, matter has a fixed shape and volume; in liquids, it takes the shape of its container but has a fixed volume; and in gases, matter fills the space available to it. The amount of matter in an object is related to its mass, which is the measure of the amount of matter it contains.

Matter is made up of atoms, which are the smallest units of matter. These atoms combine to form molecules, which make up the substances we see around us. For example, water is made of molecules, each of which is made of atoms of hydrogen and oxygen.

In simple terms, matter is everything we can touch, see, or measure. Anything that has mass and occupies space is considered matter.