Which groups of organisms dominated photosynthesis in the oceans during the Paleozoic Era?

Question

Quizplus · Accepted Answer

Cyanobacteria and Archaeplastids (which includes green algae and land plants) dominated photosynthesis in the oceans during the Paleozoic Era. This is supported by fossil evidence and the fact that these groups still play major roles in primary production in modern oceans. The other options, which include Alveolates and Stramenopiles, were not major contributors to photosynthesis until later in evolutionary history.

Which Groups of Organisms Dominated Photosynthesis in the Oceans During