Evidence for Evolution

HideShow resource information
What is gradual replacement?
Things like teeth, shells and bones don't decay easily so last for ages whilst buried. They're eventually REPLACED by minerals which forms a rock-like substance shaped like the original hard part. The fossil stays DISTINCT inside the the rock.
1 of 9
How can fossils be formed from casts and impressions?
If an organism is buried in soft material like clay, the clay HARDENS around it and the organism DECAYS, leaving a cast of itself. Footprints leave impressions when soft material hardens = impressions
2 of 9
How can fossils be formed by preservation?
Preservation occurs when no decay has happened, which leaves something perfectly intact. This only happens in places that aren't suitable for microbes to work, e.g. in a peat bog that is too acidic.
3 of 9
What are the three things we can learn from fossils found in layers of rock?
The age of the fossil, what plants and creatures used to look like and how they've evolved and developed over billions of years.
4 of 9
What are the three reasons for the fossil record being incomplete?
Not all fossils have been discovered, very few dead plants and animals actually turn into fossils and just decay instead and some body parts like soft tissue decays away completely.
5 of 9
Why do pentadactyl lims prove evidence for evolution?
It is a limb with 5 digits that can be seen in many species such as mammals, reptiles and amphibians. This similarity in bone structure suggests that we have all evolved from a common ANCESTOR, as this would be a very unlikely occurence otherwise.
6 of 9
What is the definition of a tissue?
A tissue is a GROUP of SIMILAR cells that work together to carry out a FUNCTION.
7 of 9
What is the definition of an organ?
An organ is a GROUP of DIFFERENT TISSUES that work together to carry out a particular function.
8 of 9
What is the definition of an organ system?
An organ system is a GROUP of ORGANS working together to perform a particular FUNCTION.
9 of 9

Other cards in this set

Card 2

Front

How can fossils be formed from casts and impressions?

Back

If an organism is buried in soft material like clay, the clay HARDENS around it and the organism DECAYS, leaving a cast of itself. Footprints leave impressions when soft material hardens = impressions

Card 3

Front

How can fossils be formed by preservation?

Back

Preview of the front of card 3

Card 4

Front

What are the three things we can learn from fossils found in layers of rock?

Back

Preview of the front of card 4

Card 5

Front

What are the three reasons for the fossil record being incomplete?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Evolution, extinction and natural selection resources »