1-3 Studying Life
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1-3 Studying Life
Characteristics of Living Things
What are some characteristics of living
things?
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1-3 Studying Life
Characteristics of Living Things
1. Living things share the following
characteristics:
• A. made up of cells
• B. reproduce
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1. Asexual Reproduction:
1 parent; offspring identical to parent
2. Sexual Reproduction:
2 parents
C. based on a universal genetic code
D. grow and develop
E. obtain and use materials and energy
F. respond to their environment
G. Homeostasis: maintain a stable internal
environment
H. change over time
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1-3 Studying Life
Branches of Biology
2. Levels of organization of life
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1-3 Studying Life
Branches of Biology
A. Atom: smallest unit of most chemical compounds
B. Molecules: Groups of atoms;
Water
DNA
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1-3 Studying Life
Branches of Biology
C. CellsSmallest functional unit of life
Nerve cell
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1-3 Studying Life
Branches of Biology
D. Tissues: Groups of Cells
E. Organs: Group of tissues
F. Organ systems: Group of organs
Nervous tissue
Brain
Nervous system
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1-3 Studying Life
Branches of Biology
G. Organism:
Individual living thing
Bison
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1-3 Studying Life
Branches of Biology
H. Population:
Group of organisms of one type that live in the same
area
Bison herd
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1-3 Studying Life
Branches of Biology
I. Community:
Populations that live together in a defined area
Hawk, snake, bison, prairie dog, grass
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1-3 Studying Life
Branches of Biology
J. Ecosystem:
Community and its nonliving surroundings
Hawk, snake, bison, prairie dog, grass, stream, rocks, air
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1-3 Studying Life
Branches of Biology
K.Biosphere
The part of Earth that contains all ecosystems
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1-3 Studying Life
Branches of Biology
3. Biology:
*study of life
4. Branches of Biology
For example:
• A. Zoologists study animals.
• B. Botanists study plants.
• C.Paleontologists study ancient life.
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