TOPIC 29: Tetrapods

Question 1

vertebrtaes with two pairs of sturdy skeleton supporting limbs with feet and digits

Answer 1

tetrapods

Question 2

what did the evolution of a fin to a limb aid in for living on land

Answer 2

supported weight and movement

Question 3

why did tetrapods move to land

Answer 3

1. colonization by other organisms
2. little competition on land
3. environmental changes

Question 4

challenges on land

Answer 4

1. gravity
2. water conservation
3. reproduction
4. gas exchange
5. locomotion
6. sensory perception
7. tempurature reulation

Question 5

transitioned tetrapods mainly retained their aquatic features, what two things did they develop on land?

Answer 5

lungs and limbs

Question 6

5 adaptations necessaryy for tetrapods to transfer to land

Answer 6

1. backbone
2. nostrils
3. lungs
4. bony muscular pectoral fins
5. skeleton mineralization

Question 7

the earliest organims that shows evidence of tetrapods transitioning to land

Answer 7

tiktaalik

Question 8

fish traits in the tiktaalik

Answer 8

scales, lobed fins, gills and lungs

Question 9

tetrapod traits in tiktaalik

Answer 9

flat skull, neck structure, ribs , skeleton

Question 10

tiktaalik feature that provide evidence for land trasition

Answer 10

distinct neck and size of pectoral pelvisthats not attatched to the backbone

Question 11

evidence that the acanthostega was an tetrapod transitioning to land

Answer 11

1. joint knees and ankle joints (not ready to bear weight)
2. short ribs

Question 12

two groups of extant tetrapods

Answer 12

1. amphibia (true tetrapods)
2. amniota

Question 13

shared traits of tetrapods

Answer 13

1. 4 limbs and feet with digits
2. neck
3. fushion of pelvic girdle
4. absent gills
5. ears