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Fossilisation

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Submitted By naoms18
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Describe the two theories for how life began on earth:
• the two theories are called panspermia and formation of chemicals on earth

Panspermia
• Gravity pulled down meteorites, causing organic molecules to be present on earth

Formation of Chemicals on Earth
• Life began here on earth by the formation of organic molecules. The early earth environment had no free oxygen and therefore was a good environment for the formation of organic molecules in the primordial soup

Identify the theory that Oparin formulated to explain the formation of organic molecules on earth. (chemosynthesis theory)
• Oparin formulated the theory that the conditions of earth contained all the necessary chemicals combined with electrical storms and

Distinguish between prokaryotic and eukaryotic cells.
Eukaryotic have membrane-bound organelles. Can be single or multicellular organisms.
Prokaryotic do not, therefore the DNA is in the cytoplasm. Prokaryotic are unicellular organisms

Explain why fossilization is a rare event
It is a process that happens over thousands of years, and requires the animal to be buried under layers of sediment, but not so much that the bones are squashed. The sediment above it must harden, and a cast must be formed. This occurs when water washes through and dissolves bones. The minerals must be left behind and take the place of the bones. The chances of there being perfect conditions for this to take place are highly unlikely. Chances of predation, being squashed under sediment are far more probable. Therefore, it is a rarity that the conditions for fossilization to occur.

The earth is dynamic and ever changing
Early life is believed to hve originated under anoxic (no oxygen) conditions
-oxygen wastes given off early life autotrophs helped to form our oxygen rich atmosphere. These were called stromadalites iron oxide deposits in ancient rock…...

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