Three reasons why tropics show greatest levels of species diversity:
1. Stable climate: The tropics have a warm, stable climate with little seasonal variation. This consistency allows for the evolution and survival of a wide range of species.
2. High primary productivity: The tropical regions, especially rainforests, have high primary productivity due to abundant sunlight, rainfall, and warm temperatures, supporting a wide range of organisms.
3. Ecological niches: The tropics have a diverse range of habitats, creating multiple ecological niches where different species can evolve and coexist.
If vector \( \mathbf{a} = 3 \hat{i} + 2 \hat{j} - \hat{k} \) \text{ and } \( \mathbf{b} = \hat{i} - \hat{j} + \hat{k} \), then which of the following is correct?