Evolution (02)

 

Species that are unable to adapt to changing environments and are unable to face 
competition from other species eventually become extinct. However, the fossil 
record retains much evidence of these older species. Using the current fossil
 and DNA evidence, trace the continuous descent of all species remaining on Earth today.

It is believed to be possible [60]. As a result of photosynthesis, the amount of 
oxygen in the atmosphere increased and the ozone layer was formed. Smaller cells within
 larger cells fused to form multicellular organisms called eukaryotes[61].
 Cells from specific species groups differentiated and became multicellular organisms.
 The ozone layer protects the earth's surface from ultraviolet radiation.

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