Final answer:
In the late 1940s and early 1950s, the field of biological classification saw improvements with significant revisions to the Linnaean classification system to incorporate genetic and biochemical data.
Step-by-step explanation:
In the late 1940s and early 1950s, the field of biological classification saw improvements rather than being abandoned or unaffected. The Linnaean classification system, introduced by Carl Linnaeus in the 18th century, laid the groundwork for modern taxonomy. This system was based on observable morphological traits such as the number of legs or the shape of leaves. However, with advancements in science, especially in the areas of biochemistry and genetics, the Linnaean system has undergone significant revisions.
These revisions have allowed scientists to classify organisms more accurately, considering both biochemical and genetic similarities and differences in addition to outward morphology. Therefore, it can be said that during this time, option 3, the classification system was improved, is correct. Continuous refinement in the understanding of evolutionary relationships among organisms has been a cornerstone of taxonomy and systematics.