2 Origins of Water 9

2 Origins of Water 9 - First land plants 480 mya Primitive...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
emergence of complex cells and multi-cellular organisms Oxygen in the Atmosphere/Oceans All of these organisms lived in the oceans. Why? 1 bya
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
~ 500 million years Higher Oxygen Levels Ozone Layer Terrestrial Life The ozone layer screens out harmful UV radiation
Background image of page 2
Carboniferous Period About 350 million years ago “the age of swamps and coal"
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: First land plants: 480 mya. Primitive bark-bearing trees (lignin) 245 mya – 65 mya Age of Reptiles Warm Wet Productive Primates ~30 million years ago Pre-humans ~5-8 million years ago Homo sapiens ~200,000 years ago Mammals ~65 million years ago Subsequent Timeline Reptiles ~ 245 million years ago...
View Full Document

This note was uploaded on 02/10/2011 for the course SWS 2007 taught by Professor bonczek during the Fall '09 term at University of Florida.

Page1 / 5

2 Origins of Water 9 - First land plants 480 mya Primitive...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online