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study of the geographical distribution of plants and animals.
cellular respiration that takes place in the presence of free oxygen.
a layer of ozone gas which occurs naturally in the upper atmosphere, and protects life by...
membrane-bound compartments inside chloroplasts and cyanobacteria. They are the site of the...
the introduction of harmful substances (pollutants) into the environment.
a sticky film that forms on the enamel of teeth. It is made up of small food particles, saliva...