An era with extremely high rates of speciation is described by the punctuated equilibrium model.
Even though there appears to be a lot of blood, a female typically only sheds a few tablespoons of blood over her whole period. About three to six times each day, most girls need to replace their pads, tampons, or menstrual cups.
Because they lack uteruses, men do not experience menstruation, but their bodies do alter and grow in similar ways. For instance, people may alter their voice or grow hair on their faces and other areas of their body. So even though they don't have periods, males' bodies still undergo alteration.
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