Question

The Human Microbiome Project revealed ________.

a. vast numbers of organisms are found on expansive, dry areas of the skin
b. high salt areas of the skin limit bacterial growth
c. the skin microbiota changes constantly over time
d. the skin microbiome is much more varied than previously thought
e. All of the choices are correct.

Answer 1

The Human Microbiome Project revealed that the skin microbiome is much more varied than previously thought, with different areas of the skin providing diverse habitats for a wide range of microorganisms.

Step-by-step explanation:

The Human Microbiome Project revealed that the skin microbiome is much more varied than previously thought (d). This project has provided a detailed understanding of how different parts of the body offer diverse habitats for microorganisms, much like distinct ecosystems. For instance, the dry areas of the skin, such as the forearms, resemble arid deserts and are preferable for Gram-positive bacteria, while the moist areas like the underarms are conducive to a richer and more varied microbial community, including Gram-negative bacteria.

Different factors such as moisture, oiliness, and temperature affect the types of microorganisms that thrive in various regions of the skin. For example, oily parts of the skin can harbor dense populations of specific bacteria. This entire ecosystem is balanced under normal conditions, with the normal microbiota providing protection against pathogenic invasions by producing antimicrobial substances.