During the Silurian, the oxygen gas concentration in the atmosphere is postulated to have reached an amount equivalent to more than 10 percent of its present-day concentration. Thus, nearly all lethal ultraviolet radiation was eliminated from the atmosphere, making dry land available for newly evolved forms. Which of the following major events in the evolution of animals and plants probably occurred at this time?

Question

Quizplus · Accepted Answer

During the Silurian period, the colonization of land by plants began, with primitive bryophytes (like mosses) and fern-like plants being among the first to appear. Amphibians, seed plants, and land-dwelling animals like crayfish evolved later in the geological timeline.

During the Silurian, the Oxygen Gas Concentration in the Atmosphere