Summary of When Life Moved To Land & The Disastrous Consequences | GEO GIRL

00:00:00 - 00:20:00

The video discusses the major events in the history of life on Earth, including the transition from water to land, the various organisms that made this transition, and the consequences of this. The video also discusses the importance of stromatolites in this process.

• 00:00:00 This video discusses when life moved to land, the various organisms that moved with it, and the consequences of this. The video also includes a discussion of stromatolites, which were important in this transition period.
• 00:05:00 The four major evolutionary steps of plant evolution are outlined in this class paper. Mosses and non-vascular plants like them evolved first, due to the difficulty of rooting and transporting nutrients efficiently in air. Vascular plants evolved in the second step, followed by seed plants in the third step, and finally angiosperms in the fourth step. Angiosperms didn't happen until after plants had already been on land for a while.
• 00:10:00 Changes in Earth's climate and environment around 470 years ago are likely responsible for the evolution of non-vascular plants, which in turn led to the late Ordovician Mass Extinction event. Moss, which helped increase weathering and nutrient fluxes to the ocean, played an important role in this process.
• 00:15:00 During the Devonian period, the spread of vascular plants caused an increase in carbon burial, which decreased carbon dioxide in the atmosphere and cooled the globe. This led to the second of the five major mass extinctions events in Earth's history, the Late Devonian extinction. Among the invertebrates that invaded land during this time were the earliest invaders of land, the lobe fin fish. However, the transition to land for lobe fin fish was not made sooner because they required shade for their sensitive skin and were primed for the transition by their traits of land like traits and marine like traits. The amphibian lineage began with the transitional species, Tiktaalik.
• 00:20:00 In this video, Hannah talks about some of the major events in geobiology, including the fungi transition to land. She provides references for further reading.