Question

Which one of the following is shown by population change?
a) Migration
b) Birth rate
c) death rate
d) all of these​

Answer 1

Answer:

Immigration is the action of coming into an area from another area or country.

Natality is the ratio of the number of births to the size of the population, birth rate. Mortality is the relative frequency of deaths in a specific population, death rate. Emigration is the number of immigrants during a particular time interval. Population density is the change in population size at a given time interval. Emigration and mortality will decrease the population density whereas immigration and natality will increase the population density.

Migration

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Answer 2

Answe

d,

Explanation:

The size of a population for any species is not a static parameter. It keeps changing in time, depending on various factors including food availability, predation pressure and reduces weather. In fact, it is these changes in population density that give us some idea of what is happening to the population - whether it is flourishing or declining. Whatever might be the ultimate reasons, the density of a population in a given habitat during a given period fluctuates due to changes in four basic processes, two of which (natality and immigration) contribute an increase in population density and two (mortality and emigration) to a decrease.

(i) Natality in population ecology is the scientific term for birth rate.

(ii) Mortality is the number of deaths in the population during a given period.

(iii) Immigration is the number of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration.

(iv) Emigration is the number of individuals of the population who left the habitat and gone elsewhere during the time period under consideration.

Hence, mathematically, Population change will be:

birth +death + migration...