Various components are:

Those chemicals, which are released by one organism but they destroy the other organism are precisely called:

Which of the following pollutant is not the product of automobile exhaust?

Peacock eats a snake and snake eats frog and frog eats insect while insect eats green plant, then position of peacock is:

Reaction wood or abnormal wood are:

The necessary human resources could be developed through a combination of activities initiated with the objective of: