Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test English Vocabulary One Word Substitution
Choose the word that can substitute the given sentence.
A study of interrelationship of organism and their environments
1
Environment
2
Ecology
3
Biotech
4
More than one of the above
5
None of the above