Examlex
Adaptation to darkness is possible because of the presence of ____in the periphery of your retina.
Inhibitor
A substance that slows down or prevents a particular chemical reaction or other process.
Activated
The state of being turned on or made active, often referring to a chemical or biological process.
Gene
A unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.
Hydrogen Atoms
A hydrogen atom consists of one proton and one electron; it is the simplest and most abundant atom in the universe.
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