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Biology Lab 2
Test 1
15 cards·by karolinaclaire
when was the phanerzoic era
0-542 million years ago
when was the proterozoic eon?
542-2,500 million years ago
when was the achaean eons
4,000- 2,500 million years ago
when was the cenozoic era?
65-0 million years ago
when was the mesozoic era
65-251 million years ago
when was the paleozoic era?
542-251 million years ago
Formation of the Earth
4.6 bya
Evolution of the first true cells
3.5 bya
Accumulation of oxygen in the atmosphere to detectable levels
3 bya.
Appearance of the first eukaryotic organisms
2 bya.
Appearance of the first multicellular organisms
1 bya-600 mya.
Colonization of land by fungi
500 mya
Appearance of the first primates
65 mya.
First appearance of the genus Homo
2 mya.
Appearance of the first Homo sapiens
200000 years ago.