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Chapter 19
chapter 19 vocabulary
23
Biology
9th Grade
09/07/2009

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Term
population
Definition
The distribution of individuals among different ages in a population.
Term
population density
Definition
how crowded a population is
Term
dispertion
Definition
The spatial distribution of individuals within the population.
Term
birth rate
Definition
number of births in a give amount of time
Term
death rate
Definition
number of deaths in a period of time
Term
life expectancy
Definition
how long an organism is expected to live
Term
survivorship curves
Definition
Show the probability that a member of the population will survive.
Term
age structure
Definition
The distribution of individuals among different ages in a population.
Term
growth rate
Definition
the amount of changes over time
Term
immigration
Definition
movement of individuals into a population.
Term
emigration
Definition
movement of individuals out of a poulation
Term
exponiential model
Definition
A model that shows the exponential population growth in a population
Term
limiting factor
Definition
restrains growth of a population
Term
logistical model
Definition
The exponential model, but it is combined with limiting factors
Term
carrying capacity
Definition
number of organisms an ecosystem can support
Term
Density-independent Factors
Definition
Factors that are not determined by the size of the population
Term
Density-dependant Factors
Definition
Factors that are determined by the size of the population
Term
inbreeding
Definition
mating with relatives
Term
Hunter-gatherer lifestyle
Definition
The lifestyle of looking for food instead of growing it.
Term
Agricultural revolution
Definition
the dramatic change in lifestyle from hunting to farming
Term
Developed country
Definition
Modern industralized countries
Term
Developing country
Definition
Poorer countries who have a fast growing populatuion.
Term
Demographic transition
Definition
Shows the changes in population
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