Biology Ecology 2 complete latest update 2024 solution
Population density the number of individuals that live in a defined area.
different, same Populations of different species often have very __________ densities, even in the ___________ environment.
geographic range ...
Population density the number of individuals that live in a defined area.
different, samePopulations of different species often have very __________ densities, even in the
___________ environment.
geographic range the area inhabited by a population
size, species A population's range can vary enormously in ______, depending on the
____________.
Distribution/dispersion how individuals in a population are spaced out across the range of
the population
randomly, uniformly, or mostly concentrated in clumps Three types of distribution
Population dispersion how a population is spread in an area.
demographic transition a dramatic change from high birthrates and death rates to low
birthrates and death rates.
three The demographic transition is divided into ___________ stages
Stage I birthrates and death rates are high for most of history.
Stage II advances in nutrition, sanitation, and medicine lead to lower death rates.
Birth Rates remain high for a time, so births greatly exceed deaths and the population increases
exponentially.
Stage III as the level of education and living standards rise, families have fewer children
and the birthrate falls; population growth slows.
, demographic transition, meets, stops The ____________ is complete when the birthrate
__________ the death rate, and population growth ________.
down, logistic The rate of growth of human population is going _________, and our J shaped
curve might turn into a ________ growth curve.
age structure the number of males and females of each age a population contains
equal, slow In the United States, there are nearly _______ numbers of people in each age
group.
This age structure predicts a _______ but steady growth rate for the near future.
(diagram looks like a steady U shape)
young children, double In Guatemala, on the other hand, there are many more _______
than teenagers, and many more teenagers than adults.
This age structure predicts a population that will ________ in about 30 years.
(Diagram looks like sharp V-shaped)
Immigration, births, emigration, deaths Four factor that determined changes in a
population's size
always changing The size of a population is ____________________
Immigration Moving in
Emigration moving out
available resources Population growth is based on ______________________
Exponential growth a rapid population increase due to an abundance of resources.
exponential growth, larger, faster, larger In ___________________, the ________ a
population gets, the _______ it grows. The size of each generation of offspring will be ______
than the generation before it.
Logistic growth due to a population facing limited resources.
occurs when a population's growth slows and then stops, following a period of exponential
growth.
Carrying capacity the maximum number of individuals in a population that the environment
can support.
population crash a dramatic decline in the size of a population over a short period of time.
Ecological succession a series of more-or-less predictable changes that occur in a community
over time.
regenerates or creates a community after a disturbance.
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