Classifying Life

Animals are divided into: ____________ and ____________

They are animals with backbone

• vertebrates

• invertebrates

They are animals like sea stars, sea cucumber, and sea urchins

• mollusks

• echinoderms

• arthropods

The smallest group of animal classification

• phylum

• class

• species

_____________ is the scientific study of how organisms are classified and named.

• Taxonomy

• Classification

The levels of classification of organisms in order are: domain, kingdom, phylum, class, order, family, genus, and species. The broadest, least specific level is ___________.

• domain

• species

To identify an unfamiliar organism, you could us a field guide and a _____________.

• microscope

• taxonomy key

In Linnaeus's classification system, the smallest group was the ________.

• domain

• species

As you move down the levels of classification, from domain to species, the number of organisms in each group ____________.

• gets bigger

• gets smaller

Organisms in the same family are __________ closely related than organisms in the same order. (Think about the order of classification)

• more

• less