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(a) What is adaptive radiation?
(b) Give a reason why organisms become resistant to drugs.

Answer Text:
a)- It is an evolutionary phenomena where organisms of the same embryonic origin become adapted (modified) in different ways in order to
perform different functions. The organisms are separated due to natural factors and so adapt to different habitats.
b)- When an organisms is exposed to drugs for some time it become used (adapted) to living in presence of the drug. The offspring
mutate therefore survive in the presence of the drug and become drug resistance