Plants that are small, rely on water for reproduction, and lack true roots, stems and leaves are

a)
coniferous.

b)
deciduous.

c)
non-vascular.

d)
vascular.

The answer is non-vascular. They are low to the ground because they do not have vascular systems to bring the nutrients throughout the plant. And they are too low to reproduce by wind so they need water.

Don’t use up to much of them it leads to pollution

Ashould be answer.