Answer:
<u><em>River valley civilizations</em></u>
Explanation:
They were centred around various river valleys as their main source of livelihood and the flourished only due tiote river valley on which they were based. Like the harappan in Indus Valley, The yellow river (Huang He), the Mesopotamia around Tigris and Euphrates and the egyptian Nile.
1.responsiveness to the environment
2.growth and change
3.ability to reproduce
4. Having a metabolism and breathing
5. Maintain homeostasis
6.being made of cells
7.passing traits onto offspring
South America is the world leader in Hydroelectric power. Hope this helps
