Final answer:
Organisms on the skin surface easily removed by handwashing are known as normal flora, including bacteria like Staphylococcus epidermidis and others that are a part of the skin's natural microbial balance.
Step-by-step explanation:
The organisms on the surface of the skin that can easily be removed by handwashing are known as normal flora. These organisms are a mix of commensal bacteria which typically pose no harm to a healthy individual and include various types, such as Staphylococcus epidermidis, that are part of the skin's natural defense system. Handwashing is effective at removing transient microbes that are not as firmly attached to the skin surface as the normal flora.
On different regions of the skin, the normal microbiota may vary, especially in dry versus moist areas. Among these, four most common bacteria that form part of the normal skin microbiota include the following: Actinobacteria (such as Micrococcus, Corynebacterium, Mycobacterium), Firmicutes (like Staphylococcus species), and Proteobacteria (Gram-negative bacteria). These organisms are essential for maintaining a balanced microbial environment on the skin, which is important for overall skin health and protection against pathogenic invasion.