- Catastrophe hypothesis
- Energy input hypothesis
- Evolutionary speed hypothesis
- Productivity hypothesis
- 4.6 million
- 4.6 billion
- 4.6 trillion
- 1.5 million
- Pedogenesis
- Pedology
- Ichthyology
- Siesmology
- Gibbons
- Gorillas
- Chimpanzees
- All of these
- Spine
- Fur
- Both a & b
- Awn
- Heredity
- Female activation
- Egg developement
- Both a and c
- Overhydration
- Osmotic adjutment
- Salt depletion
- All of the above
- Hag fishes
- Lampreys
- Sharks and rays
- Both a and b
- Olfactory area
- Otic area
- Lower jaw
- Both a and b
- External or internal nares
- Eyes
- Skin organs
- All of the above
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