Identify incorrect combinations.

I.	Primary succession	Lichens	Pioneer plants
II.	Secondary succession	Abandoned farmland	Very slow
III.	Pollinators	Honey bee	Regulating service
IV.	Scrub	Seral stage	Hydrarch

Secondary succession begins in areas where natural biotic communities have been destroyed such as in abandoned farm lands, burned or cut forests, lands that have been flooded. Since some soil or sediment is present, succession is faster than primary succession. Pollinators are comes under supporting services.