GCSE Biology

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GCSE Biology
2012-03-20 17:04:59
evolution part need finish this card

revision B1.8
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  1. define evolution
    chnages in the chracteristics of species over time
  2. when do scientist think that life on earth began
    3 billion years ago
  3. how many species of living organsisms exist today
    30 million
  4. how many species of living organsisms are thought to have existed since life on earth began
    3-4 billion
  5. what has happened to many living organisms that have existed since life on earth began
    they have become extinct
  6. scientists have collected a lot of evidence for evolution from ...
  7. geologists can date the ..... where fossils are found , this is known as .....
    • rock
    • carbon dating
  8. what are fossils
    thay are the remains or partial remains of organisms that lived in the past found in preserved rock or in evidence of organisms having been there
  9. fossils can tell us
    • the shape of an animal
    • size of an animal
    • what age the animal lived in
    • and what the animal looked like in terms of structure and appearance
  10. fossils allow us to see the ....
    relationship between present organisms and past organisms
  11. fossils are fomed :
    • 1) when an animal dies but doesnt decompose , it just ends up getting preserved in ice for example
    • 2) when soft body tissue of an animal deacays and the hard material such as shells and bones are fossilised
    • 3) by imprints for example footprints are fossilised and a cast is made
  12. fossils can be formed in many ways
    one way includes
    when an animal ..... , the .... parts of its ..... .... leaving the ..... parts such as .... and .... . tiny .... and spaces develop in the ..... . ...... work thier eway it and gradually replace it and a fossil is formed
    • dies
    • soft
    • body
    • decay
    • hard
    • bones
    • teeth
    • holes
    • bone
    • minerals
  13. fossils can be formed in many ways
    one way includes
    there are other kinds of fossils , such as .... , which become covered by ... and .... into ...
    • footprints
    • mud
    • harden
    • rock
  14. fossils can be formed in many ways
    one way includes
    in other cases a ..... is produced when a ..... ... becomes ..... in ..... . the organism ...... leaving a .... (or ....) which shows the ..... of the organism
    • mould
    • dead
    • organism
    • buried
    • mud
    • deacys
    • space
    • mould
    • shape
  15. fossils can be formed in many ways
    one way includes
    another method is where animals have become .... by a .... .... which stops them .... e.g. amber , ice and tar
    • covered
    • natural
    • preservative
    • deacying
  16. only a tiny fraction of the organisms which have died become fossilised . Suggest a possible reason for this
    • lots of animals were mainly soft bodied
    • or it could be that there are many fossils deep in the earths crust ans sea bed , so we just havent found them yet
  17. suggest a reason why animals become extinct
    • natural disaters e.g flooding
    • food shortages
  18. name a long extinct species
  19. name a more recently extinct species
    golden toad
  20. fill in the below table
  21. The question is this. In your reading of this tree, which group is the most closely related to fishes: frogs, lizards, birds, cats, or humans?
  22. plants and animals develop by a process called .... this takes place over ..... of years .The Greek scientist An..... first came up with the idea of evolution in about 520 BC . he said that all life origionally started off as a sort of slime and over mnay yeats developed into other forms of life
    • evolution
    • millions
    • Anaximander
  23. in 1801 , Jean-Baptiste L... came up with the theory that .... .... features that had been ..... by thier parents . Today we can see that this theory is not true
    • lamarcak
    • offspring
    • inherited
    • developed