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Genetic methods of detecting microorganisms reveal that the number of bacterial species in nature exceeds previous estimates by several orders of magnitude. In human mouths, for example, it is estimated that 500-700 microbial species are normally present. Explain why previous estimates were low.
Havelock Ellis
was a British physician and psychologist known for his studies on human sexuality and for being a pioneer in sexual psychology.
Sexual Theorist
An expert or scholar who studies and formulates theories regarding sexuality, sexual behaviors, and related topics.
Experimental Research
The systematic manipulation of an individual or the environment to learn the effect of such manipulation on behavior.
Correlational Studies
Research methods that examine the relationship between two or more variables, without inferring a causal relationship.
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