Environmental scientists are using GPS ( It is effective but expensive) aerial monitoring (Quick but not the easiest), RFID tags, (mostly for long-term monitoring) and hidden cameras are used to study polar bear behavior without interruption to their environment.
Answer:
(B)iology
Explanation:
Biology is a branch of science that studies about the living organisms.
When it triggers an abnormal or vigorous immune responce, treating the antigen that would normally cause no threat as something harmful.
