One of the first acts in taxonomy is

The correct option is Identification.

In the field of taxonomy (the science of naming, describing, and classifying organisms), the very first step in studying a new or unknown organism is to recognize its essential characteristics and compare them with already known organisms. This initial step is called identification.
Before an organism can be described, named, or placed into a hierarchical classification system, it must first be identified to determine if it is already known to science or if it is entirely new.

The systematic order of taxonomic procedures generally follows these stages:
1. Identification: Recognizing the organism's features to determine its identity and relation to existing groups.
2. Nomenclature (Naming): Assigning a scientific name to the organism according to established international codes if it is determined to be new.
3. Description: Detailing the specific morphological, anatomical, and genetic traits of the organism.
4. Classification: Placing the organism into a hierarchical system (Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species) based on its relationships and traits.

Therefore, identification is fundamentally one of the first acts in taxonomy.