-
define evolution
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
30 million
-
how many species of living organsisms are thought to have existed since life on earth began
3-4 billion
-
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 ...
fossils
-
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
- dies
- soft
- body
- decay
- hard
- bones
- teeth
- holes
- bone
- minerals
-
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
-
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
-
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
-
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
- food shortages
-
name a long extinct species
dodo
-
name a more recently extinct species
golden toad
-
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?
frogs
-
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
-
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
|
|
