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Cards (12)
Give three reasons why the fossil record is not clear for older species+ INCOMPLETE
more likely to be destroyed by
geological
activity / earthquakes
fossils buried
deeper
so harder to
find
fossils
smaller
so harder to find
Is the fossil record complete?
No
Fossils
Remains
of
animals
from many (
million
) years ago
Found in rocks
OLDEST Soft-bodied organisms
Oldest organisms were soft-bodied
Decay away completely (without forming fossils)
Very few fossils
Why can't scientists be certain about how life began on Earth?
traces mainly destroyed by geological activity.
oldest organisms were soft bodied so most of the tissue decayed.
fossils buried deeper so harder to find
Why is the fossil record not complete, in terms of soft bodied?
Oldest organisms are
soft-bodied
so there were very
few fossils
Fossils formed by being replaced by
minerals
Parts of organism will not
decay
easily e.g
bones
, shells, teeth
Replaced by
minerals
Form
rocks
with the same
original
shape
Surrounding
sediments
turn to rock but the fossil will be
distinct
Fossils form from when the conditions?
Parts of organisms has not
decayed
because one or more conditions needed for decay not present e.g
ice,
peatbogs,
amber
,
tar
pits
Organism is
conserved
Traces of organisms Fossils
Soft
material e.g
clay
can
harden
around whole organisms, traces of organisms such as footprints, burrows, and rootlet traces
This forms a
cast
How does the fossil record prove Darwin's theory?
Fossils found
deeper
in the
soil
are generally from more
simple
organisms.
organisms
evolved from these
simple life forms
Observe changes in different organisms over time in life as developed on earth
Fossils
Importance of fossils
fossils show evidence of
extinction
fossils show
change
over time