Lesson 1 | Classifying Living Things
Name Date Class
Chapter 6 LESSON 1
Classifying Living Things
A. What are living things?
1. All have some characteristics in common.
a. They are made of .
b. They are into different structures.
c. They and develop.
d. They to their environment.
e. They , or form new organisms.
f. They use .
2. in cells are organized into different structures that help
cells function.
3. The four types of macromolecules in cells are nucleic ,
lipids, proteins, and .
4. organisms are made up of only one cell.
5. Multicellular organisms have different types of cells that carry out
specialized .
6. The different levels of organization in multicellular organisms are: cell,
, organ, and organ system.
7. Living things grow, or increase in , during their lifetimes.
8. Adult organisms form new organisms by asexually or
sexually.
a. Bacteria and other organisms reproduce asexually
when one cell divides and forms two new organisms.
b. Sexual reproduction occurs when the cells of one or
two parent organisms join and form a new organism.
c. Humans and other multicellular organisms reproduce .
9. are organisms that convert light energy into usable energy.
a. Many autotrophs use energy from light to convert carbon dioxide and
into carbohydrates, or sugars.
b. Organisms that grow on energy released by chemical reactions of inorganic
substances such as sulfur and ammonia are called .
1 Life’s Classification and Structure
Name Date Class
Lesson Outline continued
10. Organisms that obtain energy from other organisms are called
; they eat autotrophs or other .
11. Organisms respond and adapt to changes in their external .
B. What do living things need?
1. All living things need energy, food, , and a place to live.
2. An organism’s is the specific environment where it lives.
3. provides organisms with energy, and
is essential for survival.
4. The type of an organism eats depends on its habitat.
C. How are living things classified?
1. Classifying living things makes it easier to organisms
and to see how they are and different.
2. The naming system that gives each living thing a two-word scientific name is called
and was created by .
3. is the branch of science that classifies living things.
4. A(n) is a group of organisms.
5. All living things on Earth are divided into three groups
called .
a. Domains are divided into and then phyla, classes,
, families, genera, and .
b. A(n) is made of all organisms that can mate with one
another and produce that can reproduce.
6. Scientists today group organisms based on similarities such as how organisms
reproduce, how they process , and the types of genes
they have.
7. A(n) is a tool used to identify an organism based on its
characteristics.
Life’s Classification and Structure 2
Name Date Class
LESSON 1
Classifying Living Things
Directions: On each line, write the term from the word bank that correctly completes each sentence. Some terms
will be used more than once.
|autotroph(s) |binomial nomenclature |habitat |
|heterotroph |taxon | |
1. An organism that obtains energy from other organisms is called
a(n) .
2. An organism that converts light energy into usable energy is called
a(n) .
3. A group of organisms is called a(n) .
4. A(n) is a specific environment where an organism lives.
5. is a naming system that gives each living thing a two-word
scientific name.
6. was created more than 300 years ago by scientist Carolus
Linnaeus.
7. Most organisms are adapted to live in a specific .
8. A(n) uses light energy to convert carbon dioxide and water
into carbohydrates, or sugars.
Life’s Classification and Structure 3
Name Date Class
LESSON 1
Classifying Living Things
Key Concept How are living things classified?
Directions: Use the table to answer each question or respond to each statement on the lines provided.
1. How many species are in the same domain as the Eastern
chipmunk?
2. Explain why the number of species decreases from the top to the bottom of the chart.
3. What is the most specific taxonomic group to which the Eastern chipmunk belongs?
Explain.
Life’s Classification and Structure 4
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Lesson Outline
Content Practice A
Key Concept Builder
Table 1 Classification of the Eastern Chipmunk
Eastern chipmunk
Taxonomic Group
about 4–10 million
Domain Eukarya
Kingdom Animalia
about 2 million
about 50,000
Phylum Chordata
about 5,000
Class Mammalia
about 2,300
Order Rodentia
299
Family Sciuridae
25
Genus Tamias
1
Species Tamias
striatus
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