power5 - 1 Why did animals come out onto the dry land? 2 At...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 1 Why did animals come out onto the dry land? 2 At first, they probably didn’t stay out for long 3 Early fish-like vertebrates First reptiles Diversification of reptiles, mammalian ancestors Age of amphibians First amphibians and land plants First animals with hard skeletons, shells, etc. The Paleozoic Era saw the origins of most major animal groups, except for the birds 4 Why do we think lobe-finned fishes are related to amphibians? 5 The lobe-finned fishes had lungs and the same set of bones in their limbs as terrestrial animals, and may have evolved legs at first to walk under water or push their heads up for breathing 6 Tetrapods are the animals with 4 walking legs, i.e. all terrestrial animals beginning with amphibians
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 7 A long succession of intermediate fossils bridge the gap between bony fish and the tetrapods 8 How do amphibians bridge the gap between the aquatic and terrestrial environments? 9
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

power5 - 1 Why did animals come out onto the dry land? 2 At...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online