Teeth lungs and heatrs

• Rodent teeth
• Long incisors
• Always growing
• Diastema- space between two front teeth
• Long teeth- rodent
• 4 teeth in front rabbit
• Shredding teeth- carnivourous
• Molars- herbacious
• Possum- the most teeth

• Hearts
• Fish- 2 chambers
• Amphibians and reptiles - 3 chambers 2 atrium 1 common ventricle
• Humans and birds- 4 chambers
• Lungs
• Bird lungs
• Air sacs
• Parabronchi-Air capillaries
• Syrinx- vocal chords used for singing
• Sing 2 tones at once
• mammal lung
• Branched Bronchus
• Aveoli
• Large surface area