Alexander von Humboldt, a renowned naturalist, is known for his work on the relationship between species distribution and geographical factors. He explained how the variety of species in an area is influenced by the environmental conditions and the territory's physical features, contributing to our understanding of biogeography.
List-I (Recent Extinction) | List-II (Place) |
(A) Dodo | (I) Africa |
(B) Quagga | (II) Russia |
(C) Thylacine | (III) Mauritius |
(D) Steller’s Sea Cow | (IV) Australia |
If the value of \( \cos \alpha \) is \( \frac{\sqrt{3}}{2} \), then \( A + A = I \), where \[ A = \begin{bmatrix} \sin\alpha & -\cos\alpha \\ \cos\alpha & \sin\alpha \end{bmatrix}. \]