Show:
Column 1
Column 2
Column 3
Column 4
100

number system

Then, Science

100

Emperor

Then, government

100

Online shopping

Now, Economy

100

Rock Music

Now, Culture

200

President

Now, Government

200

Fishing

Then, Economy

200

Pottery

Then, culture

200

Thermometer

Now, Science

300

Learn how the world works

Science

300

How people get needs and wants

economy

300

Unique way of life

Culture

300

group that makes decisions

government

400

Jobs

Now, Economy

400

Medicinal Plants

Then, Science

400

Elections

Now, Government

400

Chief

Then, Government

500

Games

Then, Culture

500

Agriculture

Then, Economy