pros and cons of each
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Marine Biologist is out of the two very limited scope of what you study, which is organisms in the sea and there relatives. You would definitely be working around aquariums or even a in big natural sea reserve depending on the extent of where you live and what you study.
Wildlife Biologist really focus more on general wild animals and definitely the many habitats they live in. This field would not be very "expert" like in one area but more of general to in-depth (to a level) of all kinds of animals and their habitats. But there are some who would focus more on certain areas such as forest/desert wildlife.
I don't think there any "cons" to this, it just what YOUR preferences are and what you want to commit your life studies too if you do decide to pursue any of these career choices.
Wildlife Biologist really focus more on general wild animals and definitely the many habitats they live in. This field would not be very "expert" like in one area but more of general to in-depth (to a level) of all kinds of animals and their habitats. But there are some who would focus more on certain areas such as forest/desert wildlife.
I don't think there any "cons" to this, it just what YOUR preferences are and what you want to commit your life studies too if you do decide to pursue any of these career choices.