The correct option is D All the above
Population is defined as a number of all the organisms of the same group or species in a particular geographical area which are capable of interbreeding.
If the age distribution (per cent individuals of a given age or age
group) is plotted for the population, the resulting structure is called an age pyramid.
A population has following attributes (features):
i) Population Size or Density
ii) Birth Rate (Natality)
iii) Death Rate (Mortality)
iv) Age pyramid, etc.