Answer:

A. WOOD

REASON:

Wood is being used from the immemorial for a variety of purposes

In the past, it was the only material used in tools

Today there are a number of substitutes of wood like steel has replaced timber for the structural purposes.

For timber to maintain its present used in competition it should be properly selected for the right job; properly seasoned; properly preserved and prevented from others harmful agents the deteriorate its quality

Following are important qualities of a wood:

Strength

Stability

Availability in the required sizes

Ease with which the material can be worked

Durability

Thermal insulation

Appearance

B. METAL

REASON:

Metals are usually very strong, most durable and highly resistant to everyday wear and tear. As such, they have been used since ancient times for a lot of things. And even today with advances in technology and a lot of other things the uses of metals have broadened greatly. Metals even play a key role in the economy. Let’s look at some important and popular metals uses.

In the Construction Industry

In electronics

In medicine

Machinery, Refractory and Automobiles

Decorative products

Other Uses

Explanation:

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