Hostory Of Life On Earth Flashcards
What are the 3 Domains?
Bacteria
Eukaryotes
Archaea
What are the 4 kingdoms of eukaryotes?
Protists
Fungi
Animalia
Plantae
What are archea?
Prokaryotes that lack a peptidoglycan call wall
What is a bacteria
Prokaryotes with a peptidoglycan cell wall
What are protists?
Photosynthetic unicellular organisms
What are fungi?
Mostly multicellular
Nonmotile
Chitin walls
What are plantae?
Multicellular
Nonmotile
Photosynthetic
What are animalia
Multicellular
Motile
How old is the earth
4.5 billion years old
When did prokaryotes first appear?
3.8 billion years ago
When did Cyanobacteria evolve?
3.5 billion years ago
Why were Cyanobacteria fundamental to early earth evolution?
Produced oxygen (photosynthesis) which enables ozone layer to form protecting earth from UV rays
When time frame did eukaryotes evolve between?
1.5-2.1 billion years ago
Why did eukaryotes evolve?
Endosymbiotic relationship between bacteria
How did multicellular eukaryotes occur?
Single cell eukaryotes living in association with each other
Why did the rate of evolution increase after multicellular eukaryotes were formed?
Most organisms were aerobic
Sexual reproduction was well developed
What did fusion of gametes allow?
Genetic recombination generating variation
When did jellyfish and worms then evolve?
600 million years ago
What happened in early Cambrian period?
Explosion in eukaryotic diversity at the end of the ice age 570 million years ago
When was land colonised by plants, animals and fungi?
500 million years ago
When were most modern mammals established?
50-60 million years ago
When did humans evolve?
5-6.5 million years ago
