When we say 'survival of the fittest',does it mean that $(a)$ those which are fit only survive,or $(b)$ those that survive are called fit? Comment.

(B) The phrase 'survival of the fittest' refers to the process of natural selection. It does not mean that only those who are already 'fit' survive. Instead,it means that individuals who possess advantageous traits that allow them to survive and reproduce successfully in their specific environment are considered 'fit'. Therefore,fitness is a measure of reproductive success in a given environment,and those who survive and leave more offspring are the ones defined as 'fit'.