Examlex
Which of the following was likely the first adaptation to occur during the evolution of the human eye?
Cell Theory
A fundamental biological principle stating that all living organisms are composed of cells, which are the basic unit of life.
Prokaryotic Cell
A simple, unicellular organism without a nucleus or other membrane-bound organelles, such as bacteria.
Bacterium
Single-celled prokaryotic organisms that are members of the domain Bacteria. Lack a nucleus and membrane-bound organelles.
Cell Theory
A fundamental scientific theory that postulates that all living organisms are composed of cells, that the cell is the basic unit of life, and that all cells come from pre-existing cells.
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