1. Levels of Organization

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Organism
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3. Organism
An individual living thing that is made of cells, uses energy, reproduces, responds, grows, and develops
Organisms compete for food, water, shelter, and mates

4. R-strategist
Reproduce early in life, have many offspring, no parental care, short life span
Examples: roaches, mosquitos, ants

5. K-strategists
Reproduce later in life, have few offspring, show parental care, long life span
Examples—humans, elephants, dogs, cats

6. Population
A group of organisms, all of the same species, which live in the same place at the same time and interbreed

7. Population vocabulary
Population size: the number of individuals
Population dispersal: how they are distributed
Population density: the # of individuals in a given area

8. Community
Collection of all populations of different species that live in the same place at the same time.

9. Habitat & Niche Habitat is the place a plant or animal lives
Niche is the role the organism plays in the community

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Fundamental niche
All of the possible roles an organism could fill in a community
All the resources it COULD use
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12. Realized niche
The part of the fundamental niche the organism actually uses

13. Ecosystem
Populations of plants, animals, and micro-organisms that interact with each other in a given area and with the abiotic components of that area.

14. Ecosystem Components
Biotic factors- all the living organisms that inhabit an environment
Abiotic factors- the nonliving parts of an organism’s environment
Examples: air currents, temperature, moisture, light, and soil.

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Biomes
Terrestrial (land based) include the 7 major biomes
Tundra Desert
Taiga Tropical forest
Temperate grassland
Temperate forest
Savanna
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16. Aquatic Freshwater—streams, lakes, ponds, rivers
Wetlands-swamps, estuaries
Marine-oceans (75% of the Earth’s surface)

17. Biosphere
The portion of Earth that supports life.