How Life On Earth Caused Environmental Change

Question 1

Atmospheric oxygen

Answer 1

2.7billion guests who Archaea in the oceans developed the ability to photosynthesise

Oxygen in the atmosphere absorbed UV light, produce reactions involving O3,O2,O

Question 2

Carbon sequestration

Answer 2

Photosynthetic organism absorbed Caron dioxide, some of which was stored in sediments like rocks

This reduction in CO2 levels prevented long term temperature rise

Question 3

Biogeochemical cycles

Answer 3

As organisms evolved, interconnected biological process develoepd which produced BGC cycles
—> small amounts of some nitrites
could support life for long periods
of time

Question 4

Transpiration

Answer 4

Once plants evolved and colonised land, transpiration returned water vapour to atmosphere and increased rainfall in other areas
—> worth of even more plant life