Examlex
After nuclear reactions in the big bang had ended, about 25% of the mass of the Universe was in the form of helium nuclei.
Moro Reflex
An involuntary response seen in newborns, where they suddenly extend their arms and legs and then pull them back in if they feel like they are falling.
Stimuli
External or internal factors that elicit a response or reaction from organisms.
Automatic Response
An involuntary reaction to a stimulus that occurs without conscious thought as a result of learning or biological predisposition.
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