Examlex
When tested on the visual cliff, seven-month-old infants will usually cross the cliff to reunite with their mothers.
Bony Fishes
Fish that have skeletons primarily composed of bone tissue, as opposed to cartilaginous fishes; this group includes the vast majority of current fish species.
Placoderms
A group of extinct jawed fishes.
Extinct
The state in which a species no longer exists anywhere on Earth, often due to environmental changes, predation, or human activities.
Jawless Fish
A group of fish without jaws, such as hagfish and lampreys, representing early forms of vertebrate life.
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