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Ecosystems, Communities and Populations

Across
The Scientific study of human populations
Is the trapping of heat by gases in the atmosphere
Shorter trees and vines from another layer
A mature, relatively stable ecosystem
Consists of all the physical and biological conditions in which a species lives and the way the species obtains what it needs to survive and reproduce
One species benefits and the other is neither helped or harmed
Factors that do not depend on population size
They shed their leaves during a particular season
Occurs when a disturbance changes a community without completely destroying it
The first species to live in an area of primary succession
Occurs when one organism captures and eats another
As death rates dropped, birthrates dropped also
Down
It matters how many individuals per unit area are present
Forms from decaying leaves and makes soil fertile
One species benefits by living in or on the other and the other is harmed
The series of predictable changes that occurs in a community over time
Occurs when two species live closely together in one of three ways
Begins in an area with no remnants of an older community
Dense forests of coniferous evergreens
Is any necessity of life
The tops of tall trees form a covering
Average condition of temperature and precipitation in a region over long periods