Correct answer
D. None of the above
Explanation
The correct answer is None of the above.
Urban migration is causing the labour force to grow at annual rates of ________in LDC?
Establishment of new crop naturally or artificially is ________?
The beneficial relationship between two organisms living together is called________?
The lowest pest population that will cause economic damage is called ________?
Mastitis is an infection cause by ________?
The study process by which a productive capacity of the economy is increased over time to bring about raising levels of national output and income?