Question

taxonomy - classifying life
has taxonomy changed in the past 100 years?
no, because no new organisms have been discovered for a long time.
yes, because scientists have regularly changed the type of system used to classify living things.
yes, because scientists have made changes to the system as we have learned more about the natural world.
no, because scientists have agreed about the best ways to classify living things for a long time.

Explanation:

Taxonomy is the science of classifying living things. As our knowledge of the natural world has expanded over the past 100 years, scientists have made changes to the taxonomic system to better reflect new discoveries and understandings.

Answer:

Yes, because scientists have made changes to the system as we have learned more about the natural world.