Parts of body
Nationals
Age
100

Consist of 5 parts:

hand and foot

100

Symbol of Scotland:

thistle

100

Age of persons which are substantivizations:

The old, the young

200

The smallest part of body:

Cell

200

The most population country:

China

200

Baby who begins to walk:

Toddler

300

Plays an important role in producing  blood:

liver

300

A fundamental part of social etiquette in Japan:

Bow

300

Age which relates with numbers:

Teenager