429Glossary
microbiome, human: The over 10
14
bacteria that live in and on the adult
human body. Four phyla of bacteria are normally dominant:
Actinobacteria, Bacteroidetes, Firmicutes, and Proteobacteria. The
total mass of the adult human microbiome is approximately 1 kg.
Normally, these bacteria live commensally.
microeconomics: A branch of economics that studies how individuals,
households, or rms make decisions to allocate limited resources. It
considers SS supply and demand in markets where goods and ser-
vices are being bought and sold.
million: 1 × 10
6
(also, mega-).
Miscanthus: A genus of about 15 species of a tall perennial grass. Miscanthus
is native to tropical and subtropical regions of Africa and sou ...