In a species of slipper limpet (Crepidula fornicata), a kind of mollusk, all individuals begin life as females.
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But this is not the whole story, and it applies universally only to mammals and birds.
In other animals sex is often determined by environmental factors and can be a variable phenomenon.
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In other organisms, such as bees and wasps, in which females develop from fertilized eggs and males develop from unfertilized eggs, distribution of the sexes is unequal.
Our Living Language : Thanks to high school biology, we are accustomed to thinking of the sex of an organism as being determined by the chromosomes, notably the sex chromosome in humans (designated X or Y).
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