Yes, they opened between Fall, 1987 and Fall, 1989. Actually, WoL opened in Fall, 1989. I still have the WDW Newspaper we received at check-in in 11/89 with the headline "Wonders of Life Opens at Epcot Center"
You might want to check out this site: WDW Timeline
By the way, Horizons opened in Oct., 1983, Morocco in Sept., 1984, Living Seas in Jan., 1986, Norway in May, 1988 and Wonders of Life in Oct., 1989.
Hope this helps!
Grand Opening of Epcot at the WALT DISNEY WORLD Resort:
Opening of Future World at Epcot
* Journey Into Imagination Pavilion: The Image Works interactive area and the Magic Eye Theater featuring "Magic Journeys," the 3D film presentation.
* Spaceship Earth
* CommuniCore (CommuniCore East & CommuniCore West)
* The Land: Listen to the Land, Kitchen Kabaret, Symbiosis
* Universe of Energy
* World of Motion
Opening of World Showcase at Epcot
* The American Adventure
* Canada
* China
* France
* Germany
* Italy
* Japan
* Mexico
* United Kingdom