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CH. 5 - Evolution, Biodiversity, and Population Ecology
Consists of genetic change in population of organisms across generations.
Accidental changes in DNA.
Is the process by which traits that enhance survival and reproduction ate passed on more frequently to future generations than those that do not.
Created the theory of evolution and introduced natural selection.
Scientist who also introduced natural selection.
a group of islands in the Pacific off South America explored by Charles Darwin and Alfred wallce.
occurs when natural selection favors one of the extreme variations of a trait.
average steady version of the trait.
natural selection that favors individuals with either extreme of a trait.
selection by humans for breeding of useful traits from the natural variation among different organisms.
the variety of species living within an ecosystem.
group of similar organisms that can breed and produce fertile offspring.
a group of organisms of the same species populating a area.
formation of a new species.
The formation of a new species as a result of an ancestral population's becoming isolated by a geographic barrier.
geographic barriers to gene flow leads to evolution of reproductive isolation by natural selection.
The formation of new species in populations that live in the same geographic area.
a family tree that shows the evolutionary relationships thought to exist among groups of organisms.
mass destruction of most species.
all of the populations that live in an area.
All the living and non-living things that interect in an area.
The study of populations in relation to the environment, including environmental influences on population density and distribution, age structure, and variations in population size.
The study of how interactions between species affect community structure and organization.
The study of energy flow and the cycling of chemicals among the various biotic and abiotic components in an ecosystem.
Place where an organism lives.
A species use of resources and its functional role in a community including the environment it needs to survive, its consumption of certain foods, and its interactions with other organisms.
species that have narrow niches.
distribution where many members of the population live close together.
a distribution whose shape is evenly distributed throughout the values it takes.
distribution in which the location of members in a population is totally random.
surviviorship curves I
Humans with higher death rates at older ages.
survivorship curve II
Is intermediate and indicates equal rates of death at all ages.
survivorship curve III
Toads with the highest death rates at young ages.
graphical representations of populations' ages..
occurs when the individuals in a population reproduce at a constant rate.
Population growth that is controlled by limited resources.
largest number of individuals of a population that a environment can support.
environmental factors that restrict population growth.
Referring to any characteristic that varies according to an increase in population density.
limiting factors that affect the population, regardless of the size(abiotic).
organisms that reproduce early in life and often and have a high capacity for reproductive growth.
organisms that reproduce later in life, produce fewer offspring, and devote significant time and energy to the nurturing of their offspring.