In a species of slipper limpet (Crepidula fornicata), a kind of mollusk, all individuals begin life as females.

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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These include, but are not limited to, unprotected sex and sexual fetish activity. • It is legal for persons of my age to access sexually explicit materials, such as those to which I seek access, in my community.

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