Topic 1 - Living Things in the Biosphere Vocabulary

Made of a single cell.

• Multicellular

• Unicellular

• Bicellular

• Tricellular

Any change or signal in the environment that can make an organism react in some way.

• Response

• Stimulus

• Reaction

• Impulse

An animal with a backbone.

• Invertebrate

• Vertebrate

• Amphibian

• Reptile

The basic unit of structure and function in living things.

• Tissue

• Organ

• Cell

• Organism

A taxonomic category that names a group of similar, closely-related organisms.

• Species

• Family

• Genus

• Order

A body structure that is composed of different kinds of tissues that work together.

• Tissue

• Cell

• Organ

• Organism

A tiny, nonliving particle that enters and then reproduces inside a living cell.

• Bacteria

• Virus

• Fungus

• Protozoa

The classification system in which each organism is given a unique, two-part scientific name indicating its genus and species.

• Binomial nomenclature

• Taxonomic hierarchy

• Phylogenetic tree

• Cladistics

A group of similar cells that perform a specific function.

• Organ

• Tissue

• Cell

• Organism

Single-celled organisms that lack a nucleus; prokaryotes.

• Bacteria

• Viruses

• Fungi

• Protozoa