Definition
noun
A reference tool consisting of three or more characters at each branching point for use in identifying species.
Supplement
Word origin: poly- (many) + New Latin -tomia, from Greek -tomiā, from tomos, a cutting, from temnein, to cut.
Compare: dichotomous key
The Earth's ecosphere was rapidly changing and throwing up a wide range of ecological niches that new adaptive organisms..
Freshwater ecology focuses on the relations of aquatic organisms to their freshwater habitats. There are two forms of co..
Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..
This tutorial investigates the genetic diversity in more detail. It also delineates how certain alleles are favored over..
This tutorial elaborates on the physical development of humans, particularly from puberty to adulthood. Read this tutori..
Mutations can also influence the phenotype of an organism. This tutorial looks at the effects of chromosomal mutations, ..