Please help I really need to know these, ten points for whoever can answer all correctly
The Earliest Traces of Life
1. When do scientists think life originated on Earth?
2. What are the oldest fossils and how old are they?
The Precambrian
1. When did the first cells with nuclei appear?
2. Fossils of multicellular animals are from what time period?
3. In what era did all of these events take place?
Origin of Life
1. What six elements are most prevalent in living organisms?
2. Were these elements present in the infant solar system?
3. What circumstances may have fostered the development of chains of amino acids and nucleotides?
4. What are the characteristics of the ancestors of living cells, what could they “do”?
5. Why is water important to life?
6. What are the “true” hallmarks of life?
7. What molecular evidence do scientists have that all life is at least distantly related and has a common ancestor?
8. What conditions exist on the present day earth that make the spontaneous generation of life unlikely?
9. What conditions are thought to have existed on primitive earth that favored the origin of life?
Single-celled Life
1. What are cherts?
2. How old are these fossils?
3. Were these prokaryotic or eukaryotic?
4. What evidence for eukaryotic (and possibly multicellular) life is found in the Greyson shale?
5. How old is the shale?
Multi-celled Life
1. Describe the Ediacaran Fauna.
2. How old are these fossils?
I don’t have a textbook for it
