Question

Keystone species deserve protection because these (1)Are capable of surviving in harsh environmental conditions (2)Indicate presence of certain minerals in the soil (3)Have become rare due to overexploitation (4)Play an important role in supporting other species

Answer 1

(4) Have an important role in supporting other species.

Explanation:

Every ecosystem has certain species that are critical to the survival of the other species in the system. The keystone species could be a huge predator or an unassuming plant, but without them the ecosystem may not survive.