Final answer:
Species can be distinguished by physical characteristics, breeding behavior, and genetic analysis. Physical characteristics like body structure and coloration can help identify different species, while breeding behavior and genetic analysis can confirm species distinctions.
Step-by-step explanation:
A species can be distinguished by different methods based on their physical characteristics, breeding behavior, and genetic makeup. Physical characteristics such as body structure, coloration, and presence of specific organs can help differentiate between species. Breeding behavior, specifically whether individuals are capable of mating and producing fertile offspring, is another way to determine species. Finally, genetic analysis, including DNA sequencing, can provide insights into the genetic differences between species.
For example, in the case of butterflies, differences in wing patterns, size, and coloration can help identify different species. Additionally, if individuals from two populations cannot interbreed or produce fertile offspring, they are likely separate species. Genetic analysis can further confirm species distinctions by examining the DNA sequences of different organisms.