The answer is A. Sympatric
When climbing a mountain, we can observe transitions in biological communities that are analogous to the changes in biomes at different latitudes.
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Lactobacillus is a type of bacteria that mainly occurs in fermented media like yoghurts and curds , but they are mostly present in our body and make up a part of our microbiome by being present in our digestive tracts , genital systems and urinary tracts , doing their job without harming us.
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The most prominent example of carbon fixation is photosynthesis