Examlex
The attacks of September 11, 2001 were the first times that Islamic terrorism had been directed against the United States.
Protein-First Hypothesis
In chemical evolution, the proposal that protein originated before other macromolecules and made possible the formation of protocells.
RNA World
A hypothetical early stage in the evolution of life, where RNA served as both genetic information and as a catalyst for chemical reactions.
Enzymes
Biological catalysts that speed up chemical reactions in living organisms without being consumed in the process.
Spontaneous Generation
Spontaneous Generation is the disproved theory that living organisms could arise from nonliving matter, a belief held before the advent of modern biology.
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