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Species
Adaptations
Environment
100
This species disproved the original theory about the evolution of tetrapods
What is Acanthostega?
100
These became longer and curved in order to prevent the lungs from collapsing
What are the ribs?
100
Fish came out of the water (before/after) they evolved legs
What is after?
200
An example of a modern tetrapod
What is a lizard, snake, turtle, frog, mammal, etc.?
200
The need for this caused the number of foot digits to drop from eight to five
What is a flexible, weight-bearing ankle?
200
The sudden abundance of this type of life made shallow water inhospitable for large aquatic predators
What are vascular plants?
300
The first real tetrapods arose during this time period
What is the late Middle Devonian period?
300
One of many changes to the head region as tetrapods evolved
What is an elongated snout, smaller/fewer teeth, or separation of skull from shoulder?
300
Two challenges faced by tetrapods as they moved onto the land
What are locomotion, breathing, hearing, and dealing with gravity?
400
Tetrapods evolved from this type of fish
What is Eusthenopteron (a lobed-finned fish)?
400
In this type of breathing, the mouth cavity expands and contracts to gulp air and force it into the lungs
What is buccal pump?
400
A possible use for strong forelimbs while still in the water
What is lifting the head out of the water to breathe?
500
Something unusual about Ichthyostega
What is a highly specialized ear, spined vertebrae, or movement in a vertical plane?
500
This fish bone that orchestrates feeding and breathing movements eventually became this bone, which is a part of the tetrapod ear
What is the stapes?
500
This created a need for fish to find a new source of oxygen
What is warm, oxygen-poor shallow water?