Chapter 4
Ecosystem
all of the organisms living in an area together with their physical environment
Ecosystems  need 5 things to survive
o        Oxygeno        Watero        Energyo        Mineral nutrientso        Living organisms
Biotic
living and once living things (plants, animals, dead organisms, leaves, and waste products)
Abiotic
non-living things (rocks, water, sand, sunlight, temperature)
Organism
An individual living thing
Species
a group of organisms that are closely related & can mate to produce fertile offspring
Population
all the members of the same species that live in the same place at the same time
Community
a group of the same species that live in the same place & interact with each other
Habitat
the place an organisms live  that has specific characteristics that the organisms that live there need to survive
natural selection
 the unequal survival & reproduction that results from the presence or absence of particular traits
Evolution
a change in the genetic characteristics of a population from one generation to the next
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