Question

Why is it important to classify the millions of species on Earth?
to have common names that everyone can remember
to more easily sequence their genetic material
to devise scientific names that only scientists can learn
to organize them and speak about them accurately

Answer 1

to organize them and speak about them accurately

Classification (taxonomy) groups species by shared characteristics and evolutionary relationships so scientists can communicate unambiguously, study biodiversity, make predictions (about ecology, behavior, disease, etc.), and guide conservation. The other choices are either incorrect or secondary: common names are not universal; sequencing is aided by classification but is not its primary purpose; scientific names are universal, not meant to be learned only by scientists.