Examlex
Why is fluoride not always classified as an essential trace mineral?
Serotonin Levels
The concentration of serotonin, a neurotransmitter, in the human body that influences mood, emotional well-being, and several physical processes.
Natural Selection
A process in biological evolution where organisms with traits better suited to their environment are more likely to survive and reproduce.
Double Helix
The structure of DNA, characterized by two strands that wind around each other like a twisted ladder, discovered by James Watson and Francis Crick.
Big Bang Theory
The prevailing cosmological model explaining the early development of the Universe, suggesting it expanded from a singularly hot and dense point about 13.8 billion years ago.
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