History of life on earth
14 important questions on History of life on earth
Into what is the history of life on earth ?
When did life first appear on Earth?
What were the early life foms?
- at that time atmosphere did not contain oxygen
-bacteria had evolved, some of these could produce oxygen
- Higher grades + faster learning
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What could some single-celled organisms do which appeared 3300 millio years ago?
What evolved from these uicelulr organisms about 1600 million yars ago?
What happend around 500 million years ago?
When did some organisms crawl form tthe seas and take residence on the land?
Who evolved from that animals?
What happened around 250 million years ago?
What happened at the same time?
Since when were the mammals and birds able to develop beyond their tiny size?
What is the asteroid theory, which is nowadays the most popular concerning the extinction of thte dinosaurs?
-so much dust and debris into the air that most of the sunlight would have been bloked
-without sunlight plants and animals would die
-the dramatic changes in climate were too much for dinosaurs. They were not able to survive, mammals and birds could
When did the first human beings appear?
What does the tree of life represent?
The question on the page originate from the summary of the following study material:
- A unique study and practice tool
- Never study anything twice again
- Get the grades you hope for
- 100% sure, 100% understanding
