Biodiversity - Amphibians Flashcards
1
Q
why did organims move onto land?
3
A
- dry conditions meant less water habitat
- more prey onshore
- less predators on land
2
Q
preadaptations that allow to move on land
3
A
- heavy skeletal structure of fins
- lungs
- internal lungs
3
Q
what was the transitional form between fish and amphibians?
A
tiktaalik
4
Q
what type of organims had 6 1/2 fingers?
A
partly aquatic
5
Q
what type of organims had 8 fingers?
A
mostly aquatic - to push through water
6
Q
what type of organims had 5 fingers?
A
terrestrial - allows them to balance
7
Q
what are the clostest ancestor the tetrapods?
A
lungfish
8
Q
examples of amphibians
2
A
- frogs
- salamanders
9
Q
true or false, amphibians were the first to eveolve legs
A
true
10
Q
definition of tetrapod
A
with legs
11
Q
challenges for organsism of living on land rather than in water
5
A
- light burns skin
- need different sensory needs
- varibale temp
- water loss
- no external fertilisation
12
Q
adaptations of amphibians
9
A
- lungs
- strong vertebrae for walking and support
- ribs attach to pervic gerdal
- chromatophores absorb uv
- mucous on skin
- capillaries by skin surface
- ears
- lateral line lost as adults
- ectothermic
13
Q
what type of heart do amphibians have?
A
3 chambered
14
Q
limits of amphibians
A
- dehydrate through skin
- need water for repro
- tadpoles that need water
15
Q
what are the 3 orders of modern amphibian?
A
- frogs and toads
- salamanders and newts
- caecilans
