Which of the following phases of matter has a fixed shape and volume

A matter in the solid phase has a fixed shape and volume.

Solid phase has a fixed shape and volume

Explanation:

A solid has a definite volume and a definite shape.  

A liquid a definite volume and no definite shape.  

A gas no definite volume and no definite shape.

Solids

1. Solids have a definite volume and definite shape

2. The particles present in a solid are very closely packed since the intermolecular forces between them are very strong. The molecules do not move apart.  

Liquids

1. Liquids have a definite volume and no definite shape

2. The particles present in a liquid are closely packed since the intermolecular forces holds the molecules close together. The molecules slide over each other.

3. Liquids take up the shape of the container

Gases

1. Gases have no definite volume and no definite shape

2. The particles present in a gas are very loosely packed since the intermolecular forces are very weak.

3. There are no attractive forces between the molecules.

4. Gases spread through the container

Carbon has four electrons in its outermost shell, with these it forms covalent bond with other elements by sharing electrons with them.
The elements that made up the biological molecules react easily with carbon, giving rise to different types of macro molecules. Besides this, carbon is flexible and can conform to any shape whether linear, coiled, ring or ball form.