The phylogenetic system refers to the grouping of organisms according to their ......

Explanation

**Step-by-Step Solution:**

1. **Understanding Phylogenetic System**: The phylogenetic system is a method of classifying organisms based on their evolutionary history and relationships.

2. **Defining Phylogeny**: Phylogeny refers to the study of the evolutionary development and diversification of a species or group of organisms. It examines how different organisms are related through common ancestry.

3. **Common Ancestry**: All living organisms are believed to share a common ancestor. This means that current species have evolved from ancestral species over time through the process of evolution.

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