Examlex
Only a single sperm cell can successfully make the journey up a woman's Fallopian tube to an unfertilized egg.
Language
A system of communication used by a particular country or community, composed of spoken or written symbols.
Species
A community of similar life forms that are capable of reproducing or swapping genetic information.
Genus
A term in logic and philosophy that refers to a general class that encompasses multiple specific instances, or species, sharing common characteristics.
Species
A distinct group in biological taxonomy that shares common attributes and can breed to produce fertile offspring.
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Q137: John Bowlby, one of the earliest theorists