Evolution — BIOLOGY STD 12 Science — Question

The evolutionary term descent with modification is most often associated with human evolution, but it is actually a more general term than that would suggest. Simply put, descent with modification means that traits are passed down from generation to generation and sometimes undergo changes or modifications over time.
These changes may be caused by Natural Selection or even a mutation of $\text{DNA}$. The term became popular when Charles Darwin used it in his book The Descent of Man.
Adaptive radiation is an evolutionary pattern whereby a single ancestral form diversifies into several or many related forms. Adaptive radiation is a subset of the theory of descent with modification, expressing evolution within closely related forms rather than new designs.