OPT: (i) nutrients; (ii) organic molecules; (iii) consumers; (iv) healing of wounds; (v) water conservation; (vi) important habitats; (vii) watershed; (viii) Most plants;

Fact 1: Zinc has a positive impact on the healing of wounds. Fact 2: Sources of zinc are soil, zinc oxide, zinc sulfate, zinc chelate. Given the two facts above, what can soil have a positive impact on?
Answer:
(iv)