Great Transformation Video.docx

2 Pages
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Department
Biological Sciences
Course Code
BIOB51H3
Professor
Maydianne Andrade

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Description
BEWARE OF SPELLING (it was all done by ear) Great Transformation Video  We are all connected – common ancestor  Great transformation have opened the door for new forms  50 million land to sea  Fish colonized land  Human civilization stretches back thousands of years  Earth is old 4.6 billion years  All life on earth is shaped  Mammals – 200 million years ago, give birth to living young, breath air (adaptations) Whales (largest living animals) took their forms recently …  Whales are mammals that live in the water (but mammals originated on land) - A researcher found a fossil in Pakistan (back of a skull) the shape was familiar yet unique - Similar to the skull of a wolf (walnut size bump/ part of the inner ear), which only whales have (whales may have evolved from land mammals) - Tried to search for transitional phases - He began to search the Sahara desert (southern Mediterranean sea) - Basilasaurus (whale skeletons) 40 million years old (full time water animals) - Basilasaurus had a pelvis, knee cap and toes (complete set of leg bones) - Whales were once four legged animals - Cenonix – predatory scavenger - Over millions of years there front legs became fins, loss of fur, nostrils moved up - More transition species: Ambulacetus, rodhocetus, dorudon, basilosaurus - The way they move also shows similarities (how they move in the water) - Fish flex spine side to side but mammals ungulates its spine up and down (running or otters swimming)  Fish crawled onto lands  evolved into birds and mammals  All animals had a common ancestor  Cliffs in central Pennsylvania may have clues  the rocks are the right age – dovonium (tropical climate)  found a small shoulder bone from a tetrapod 300 million years old  most likely lived in water  Tetropods probably developed limbs first then went on land  This questions  that fish came out of water then developed limbs (which is taught in primary textbooks)  Greenland  first complete tetrapod fossil  The tetrapod had hands – againstesaga (had gills)  Some fish had arms and legs in the water (limbs already evolved)  Fin (300 million) resembles modern human bone  No goal in evolution  Series of experiments  Competition for survival (all sorts of survival strategies) BEWARE OF SPELLING (it was
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