Modern Evolutionary Classification

To group organisms based on their physical similarities only

To classify organisms according to their evolutionary relationships

To organize species by their habitat

To sort organisms by their size

To group species based on evolutionary descent

To group species by physical similarities only

To classify organisms by habitat

To organize species alphabetically

By showing current hypotheses about how evolutionary lines branched from common ancestors

By listing all species alphabetically

By grouping organisms by size

By showing only extinct species

Because the absence of a trait may be due to loss over time and not original ancestry

Because all traits are always present in all organisms

Because traits never change

Because absence of traits is more important than presence

Clades must be monophyletic

Clades include only one ancestral species and all its descendants

Clades can include unrelated species

Clades can be formed by excluding some descendants

DNA similarities help determine evolutionary relationships between species.

DNA is only used to identify physical characteristics of organisms.

DNA cannot be used to classify organisms at all.

DNA is only important for identifying extinct species.

Bacteria

Archaea

Eukarya

Plantae

It shows only mammals as the most diverse group.

It includes a time frame for each branch.

It emphasizes the large numbers of species in Eubacteria, Archaea, and single-celled eukaryotes.

It shows the actual amounts of types of organisms for each branch.

To group organisms based on their evolutionary relationships

To classify organisms by their physical appearance only

To organize species by their habitat

To sort organisms by their size