Choose from: (I) plants. (II) fungi. (III) cacti. (IV) clothing. (V) density. (VI) grass. (VII) Conifers. (VIII) h2o.

Fact 1: Roots grow in length and width from primary and secondary meristem. Fact 2: Eg., growth in plants is mostly confined to meristems. Given the two facts above, what have roots?
Answer:
(I)