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allan2009 allan2009
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14 years ago
Past exam question, not sure how to tackle it.

Our environment and life forms within it have coevolved and are intimately interdependent
a) Describe how the evolution of life and the planet were linked.
b) Decribe how biological processes could impact on the earth's future environment

(i think (a) may refer to the origin of life (premordial soup) and how water, oxygen, nitrogen etc evolved to sustain life)

(i think (b) refers to fossil fuels and global warming)     (20 marks)
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14 years ago
Well, all living things are remnants of stars - that's where elements come from - and we are made up of elements (i.e. carbon, hydrogen). After the formation of earth ~4.5 billion years ago - 10 billion years after the beginning of the universe - Earth could not sustain any form of life. Like you mentioned, the primordial soup gave rise to simple organic matter, such as simple amino acids (glycine), sugars, lipids, etc. The amino acids evolved into protein. Self-replicating proteins then became enclosed in a membrane (first cells). These first cells were anaerobic (grew at the bottom of the sea). They eventually evolved into photosynthetic bacteria, which could live in the presence of oxygen.

So basically, it all started from the big bang.

Yup, for (B), you've got the right idea.
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