Fertilization is defined as the process of union of two gametes, eggs and sperm. When mammalian eggs and sperm come into contact in the female oviduct, a series of steps is set in motion that can lead ...

Protozoa are tiny organisms that can cause diseases like malaria and giardia. Protozoan infections spread through cysts, sexual transmission, or insect bites. Diagnosing protozoan diseases involves ...

Most people – including most transgender people – are either male or female. But some people don't neatly fit into the categories of "man" or "woman," or “male” or “female.” For example, some people ...