chnages in the chracteristics of species over time
when do scientist think that life on earth began
3 billion years ago
how many species of living organsisms exist today
how many species of living organsisms are thought to have existed since life on earth began
what has happened to many living organisms that have existed since life on earth began
they have become extinct
scientists have collected a lot of evidence for evolution from ...
geologists can date the ..... where fossils are found , this is known as .....
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
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
fossils allow us to see the ....
relationship between present organisms and past organisms
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
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
fossils can be formed in many ways
one way includes there are other kinds of fossils , such as .... , which become covered by ... and .... into ...
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
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
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
suggest a reason why animals become extinct
natural disaters e.g flooding
name a long extinct species
name a more recently extinct species
fill in the below table
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?
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
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