What is the correct order of biological classification starting from the broadest category?

The correct answer reflects the comprehensive hierarchy used in biological classification, which is a system that categorizes all living organisms based on shared characteristics and evolutionary relationships. Starting with the broadest category, "Domain" encompasses all types of life, serving as the highest taxonomic rank.

Following "Domain," the next level is "Kingdom," which groups organisms based on fundamental traits, such as their cellular structure and basic metabolism. "Phylum" is the subsequent category, further dividing life into more specific groups based on major body plans and organizational features.

Next in line is "Class," which further narrows the categorization based on shared attributes. This process continues with "Order," "Family," and then "Genus," which includes organisms that are closely related and share a common ancestor. Finally, "Species" represents the most specific category, identifying individual organisms that can interbreed and produce fertile offspring.

This ordered sequence reflects the structured way scientists categorize life, emphasizing both the diversity and the underlying connections among living organisms, making option D the most accurate representation of biological classification.