Vocabulary

domain kingdom ecology ecosystem evolution natural selection adaptation

Themes in Biology

A snowy owl, with all its beauty and complexity, is just one species among the millions of species on Earth. How can one understand so many different living organisms? Important unifying themes help explain the living world and are part of biology. These themes are found within this book and include the diversity and unity of life, the interdependence of living organisms, and the evolution of life.

figure 1-5

This "tree of life," is a model of the relationships by ancestry among all major groups of organisms. The model is based on comparisons of organisms' characteristics, including body structures and genetic information. For updates on such "trees," visit go.hrw.com and enter the keyword HM6 Phylo.

Bacteria

Archaea

Protists

Domain

Domain

Domain

Bacteria

Archaea

Eukarya

Earliest cells

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