The island of Socotra, off the southeast coast of Yemen, is considered unique because ..?

Question

it possesses a unique biological habitat, containing hundreds of plant species found nowhere else on Earth or it contains one of the largest untouched tropical forest preserves in the world????

Answer 1

Because it possesses a unique biological habitat, containing hundreds of plant species found nowhere else on Earth.

"The long geological isolation of the Socotra archipelago and its fierce heat and drought have combined to create a unique and spectacular endemic flora (which may, therefore, be vulnerable to introduced species such as goats and to climate change). Surveys have revealed that more than a third of the 800 or so plant species of Socotra are found nowhere else. Botanists rank the flora of Socotra among the ten most endangered island flora in the world. The archipelago is a site of global importance for biodiversity conservation and a possible center for ecotourism. ..."

http://en.wikipedia.org/wiki/Socotra