Classification is subject to change because science is an evolving subject. New things are discovered every year and thus changing the way we understand the world around us.
Some examples could be Giraffes with long necks and the darkening of London's peppered moths after the industrial revolution. Direct selection is the shift of the population of one species towards a certain phenotype. -reference.com
Explanation:
members of the same species battle each other to protect their young
StMary's a good day for me and you are the kids going ❤️❤️ a good time☺️☺️