Chapter 18: The History of LIfe

Organisms are named and classified based on physical characteristics in

• evolutionary trees

• Linnaean taxonomy

• cladograms

• molecular clocks

Which of the following is the most abundant group of organisms on Earth?

• protista

• plants

• bacteria

• archaea

Which of the following phrases describes a taxon?

• a group of organisms in a classification system

• a group of species that share no derived characters with others in a group

• a group that can breed and produce offspring

• a group that is larger than a kingdom or a domain

Which of the following lists Linnaean taxa in the correct order from general to specific?

• phylum, order, family, genus

• kingdom, order, class, phylum

• family, phylum, genus, speies

• class, order, species, genus

Which of the following contains the most members?

• genus

• order

• family

• class

In the Linnaean system of classification, which of the following is most commonly defined as a group of organisms that can breed and produce offspring?

• phylum

• species

• genus

• order

In this blank cladogram, what type of information would go on the lines labeled A?

• clades

• outgroupings

• common ancestors

• derived characters

How many nodes are shown in this cladogram?

• three

• four

• five

• six

in the blank cladogram, what type of information would go in the area labeled B?

• clades

• outgroupings

• common ancestors

• derived characters

In the cladogram, what represents the common ancestor of all the included species?

• the line farthest left in section A

• the line farthest right in section A

• the lowest node on the cladogram

• the highest node on the cladogram