The control group outs the one that you don't change. The reason you don't change it is because you use it as a comparison with the other groups.
Answer:
Biotic and Abiotic factors
Explanation:
Biotic factors such as predators can limit the population size.
Abiotic factors such as drought,torrential rainfalls,climate change,dessication etc.
Answer:
a. hydroxyle in tyrosine
b. 3' OH
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