Pangaea began
to break up
180 million years ago
prokaryotes
60 minute clock
life originated between
3.5 and 4 bya
prokaryotes dominated from
3.5 to 2 bya
the earliest types of photosynthesis
did not produce oxygen
evidence of oxygen photosynthesis
banded iron formations
evidence for Cambrian explosion
animal diversity exploded
most of the major phyla of animals appear during the first 20 million years of the Cambrian
51 minutes
why rna not dna was likely the first genetic material
RNA was likely the first genetic material because it can both store genetic information and act as a catalyst for chemical reactions, a dual function that DNA lacks.
the Cambrian explosion
51 minutes
250 mya
plate movements brought the plates together “ Pangea”
what did the miller Urey experiment conclude
The experiment showed that organic molecules needed for life could form from simple, non-living chemicals under the right conditions — supporting the idea that life could have begun naturally on early Earth.
