Organizing Life and Classification
Science

The two-word (genus and species) naming system for organisms, like homo sapiens
Binomial nomenclature
The two-word genus and species naming system for organisms, like homo sapiens, is binomial nomenclature. It is a scientific system for naming organisms using two names to uniquely identify each species.

A model that compares DNA mutation rates to estimate how long two species have been evolving independently
Molecular clock
A model that compares DNA mutation rates to estimate how long two species have been evolving independently. Molecular clock. A molecular clock is a tool scientists use to estimate the time of evolutionary change by analyzing DNA mutations.

A unicellular or multicellular organism that is not plant, animal or fungus
Protist
A unicellular or multicellular organism that is not plant, animal, or fungus. Protist. Protists are diverse, mostly single-celled organisms that live in water or moist environments and can perform their own essential life processes.