Regarding the concept of a population and its attributes, which of the following statements are accurate?
a. A population is a group of individuals of any species in a well-defined geographical area that potentially interbreed.
b. Natural selection operates at the individual level to evolve desired traits.
c. A population has attributes like birth rates and death rates, which are expressed as per capita change.
d. An individual may be male or female, but a population has a sex ratio.
e. An age pyramid reflects the growth status of a population, showing whether it is expanding, stable, or declining.
