Why do some organisms that are not closely related look similar?

9 Principle of Adaptive Convergence or Convergent Evolution Represented... | Download Scientific Diagram

a
punctuated equilibrium
b
convergent evolution
c
radiometric dating
d
taxonomy

The answer is b) convergent evolution. Organisms that are not closely related may evolve to have similar traits or characteristics due to similar environmental pressures or adaptations. This is known as convergent evolution, where unrelated species independently evolve similar traits due to natural selection favoring similar solutions to similar problems in their environment.