L5 - Return to the Sea Flashcards
1
Q
Give 3 advantages to terrestrial life over water
A
- O2 is relatively easy to access and constant in air
- heat loss - air has a low heat conductivity and low heat capacity
- light medium - water is a heavy medium and has a high energy cost to move through it
2
Q
Dive a disadvantage to being terrestrial rather than living in water
A
Buoyancy - water is more supportive than air so less energy is needed to support a body
3
Q
Why would marine amphibians have a high salt and urea content in their body?
A
stop water leaving
4
Q
How do estuarine crocodiles get rid of salt?
A
Lingual salt glands
5
Q
Where do marine Iguanas live?
A
The Galapagos islands
6
Q
How do marine iguanas get rid of salt?
A
Salt glands on their nose
7
Q
Give 5 adaptations sea snakes have
A
- Most are viviparous
- possess sublingual salt glands
- valves in nostrils and mouth
- enlarged lungs that extend to the base of their tail
- cutaneous respiration - up to 30%
8
Q
What are the 2 families of sea turtle?
A
- cheloriidae
- dermochelyidae
