What anatomy is labeled with the letter B in the image below? 
Definitions:
Glaciation
The process of being covered by glaciers or ice sheets, often associated with ice ages and significant impacts on Earth's climate and geography.
Dense Tropical Forests
Refers to thickly wooded areas found in tropical regions with high biodiversity and significant rainfall.
Diurnal Mammalian Evolution
The evolutionary process affecting mammals that are active during the day (diurnal), leading to specific adaptations such as improved vision.
Mammalian Primate Biology
The study of the biological aspects, characteristics, and behaviors of primates, which are a group of mammals that includes humans, monkeys, and apes.
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