Evolutionary Transition: From Fish to Amphibians

Development of bone-supported fins

Development of gills

Development of scales

Development of swim bladders

Maintaining buoyancy

Extracting oxygen from water

Conserving energy during daily activities

Hovering motionlessly at any depth

Swim bladder

Lateral line system

Gills

Scales

Respiratory system

Buoyancy regulation

Environmental sensing

Digestive system

Primitive wrist joints

Robust fin structure

Neck mobility

Gills

Gills for underwater breathing

Robust fins with wrist joints

Thin, dry skin

Large eyes for night vision

Preventing desiccation and supporting body weight

Finding food and escaping predators

Developing eyesight and hearing

Growing larger in size

To minimize the mixing of oxygenated and deoxygenated blood

To increase the heart rate

To separate the atria

To pump blood at higher pressure

Tadpoles have gills and are aquatic

Metamorphosis includes limb development and tail absorption

Adult frogs are herbivores

Eggs are vulnerable to environmental conditions

The transition from fish to amphibians

The extinction of dinosaurs

The evolution of mammals

The development of flowering plants