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5.5 : History of life
BS 5 - History of life
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Slide 1:
Tekstslide
Biologie
Middelbare school
vwo
Leerjaar 3
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6 slides
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tekstslides
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1 video
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BS 5 - History of life
Slide 1 - Tekstslide
Fossils
Created when remains of organisms do not decay
Deposited layers of clay or sand cover the remains
Bacteria unable to do their work - the process of decay is stopped
Other layers of sand/clay cover the remains and over time mineralize
Slide 2 - Tekstslide
Slide 3 - Video
Geological timescale
Geological time scale: Division of the Earth's history into geological eras.
Life on Earth evolved in these eras.
Each era is divided into periods.
Periods can be divided into time slots
Numbers indicate time in millions of years ago.
You can see how many million years ago a period started and ended.
Slide 4 - Tekstslide
Animals on land
First land plants = 500 mya
Fish appeared around the same time
First land animals = 450 mya
Arthropods (centipedes in particular)
Followed by amphibians and reptiles
Reptiles were quite successful = dinosaurs 251 mya
First mammals and birds appeared alongside dino
Dinos wiped out 65 mya
Meteor collision with earth - Created black cloud of dust that hung over the earth’s surface for years
Darkened the sky = temp dropped = climate change
Hominids appeared 3 mya
Homo sapiens appeared 150,000 years ago
Slide 5 - Tekstslide
Rudimentary organs
Slide 6 - Tekstslide
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