Teaching BPSC बिहार प्राथमिक (1 to 5) शिक्षक भर्ती 4.0 Mock Test General Knowledge Ecology and Environment Ecology and Functions of an ecosystem
Choose the correct option:
1
In the lakes and rivers of the world total amount of water remain constant.
2
Underground water remain constant.
3
The total amount of world water remain constant.
4
More than one of the above
5
None of the above