17 In this example crossing over could occur between 1 and 2

Figure 32 6 Animal skeletons The forelimb and hindlimb bones of these animals differ according to the locomotor functions of the limbs fernur fore metatarsals hindlimb tibia fibula tarsals c Cat Table 32 2 Comparison of Hindlimb to Forelimb Animal Frog Differences in Hindlimb and Forelimb Bones and Explanation Bird Cat Human

Listen B Match the following pictures to the basic forms of bird wings V High speed wings 1 C Elliptical wings 2 D 3 B Passive soaring wings 4 A Active soaring wings C

Select which characteristics fit into the categories of Amniotes or early tetrapod ancestors more permeable skin more keratinized skin 1 Amniotes 2 Early tetrapod ancestor drawing air into lungs pushing air from cavities into lungs

AOTD What advantage did subdividing the gas bladders into smaller sacs provide for tetrapods Reduced surface area for gas exchange Enhanced ability to breathe underwater Increased buoyancy Increased surface area for gas exchange

the figure below Lepospondyli Ichthyostegalia includes Acanthostega and Ichthyostego Sarcopterygian ancestor Dipnoi 419 Geologic time MY ago Coelacanth Devonian Anthracosauria Amniota Diverse Devonian groups includes Eusthenopteron and Tiktoolik See Chapters 26 through 28 for details Lissamphibians Diverse temnospondyl groups Carboniferous Permian PALEOZOIC 252 MESOZOIC Frogs and toads based on Salamanders Caecilians CENOZOIC 66

Where in the body of the Daphnia is the heart located Near the midgut In the tail Adjacent to the second antenna The posterior portion of the body

What is a dog

Choose one aspect of the city of Portland that is currently unprepared for a major seismic event and propose a detailed solution that could help mitigate the effects of that event

The Permo Triassic mass extinction occurred over about O 1000 years O 60 000 years O 120 000 years O 1 000 000 years

Match the herbivore tooth type to the correct definition brachydont hypsodont Choose ever growing tooth crown for very abrasive food high tooth crown for tough abrasive vegetation short tooth crowns for soft vegetation hyselodont Choose