The map below shows the inferred shape of the North American landmass in the past. The location of Florida is labeled.

Which event was occurring on Earth when Florida was located at the equator?
(1) The dome-like uplift of the Adirondack region began.
(2) The earliest dinosaurs appeared on Earth.
(3) Oceanic oxygen began to enter the atmosphere.
(4) Earth’s first coral reefs were forming