2. Why are the classification systems changing every now and then?

Classification systems change from time to time due to several reasons:

1. New Discoveries: As scientists continue to explore and discover new species, they often need to update the classification systems to accommodate these new findings.

2. Advances in Technology: With the advancement in technology, especially in the field of genetics, scientists are now able to study organisms at a molecular level. This has led to a better understanding of the relationships between different organisms, often resulting in changes to the classification systems.

3. Improved Understanding: As our understanding of the world and its organisms improves, so does our ability to classify them. Over time, scientists may realize that previous classifications were incorrect or incomplete, leading to changes.

4. Evolutionary Changes: Over time, species evolve and change. This can lead to the need for changes in classification.

5. To Reflect Relationships: Classification systems are also updated to better reflect the relationships between different organisms. As our understanding of these relationships changes, so too do the classification systems.

In conclusion, the classification systems are dynamic and change over time to reflect our growing and changing understanding of the world and its organisms.