Question

A hard, fibrous, organic material.

a) a material made by combining a small amount of carbon with iron.
b) a mixture of aggregate, air, cement, and water.
c) building with individual units and the mortar used to hold it together.

Answer 1

A hard, fibrous, organic material is commonly referred to as composite materials. Composite materials are made from two or more constituent materials with different properties that, when combined, create a material with unique characteristics.

Step-by-step explanation:

A hard, fibrous, organic material is commonly referred to as composite materials. Composite materials are made from two or more constituent materials with different properties that, when combined, create a material with unique characteristics.

Examples of composite materials include carbon fiber reinforced plastic (CFRP), which is used in aerospace and automotive industries, and fiberglass, which is used in boats and surfboards.