Which is the best definition of a phylogenetic tree?

• A. A diagram that represents the evolutionary relationships among different species based on their genetic or morphological characteristics.
• B. A graphical representation of the food web in an ecosystem.
• C. A chart that shows the population size of a species over time.
• D. A table listing the classification hierarchy of organisms from kingdom to species.

Answer: (A)

Verified step by step guidance

1. Understand the concept of a phylogenetic tree: A phylogenetic tree is a diagram that represents the evolutionary relationships among different species, showing how they are related through common ancestors based on genetic or morphological characteristics.
2. Eliminate incorrect options: A phylogenetic tree is not a graphical representation of the food web in an ecosystem, as food webs depict feeding relationships rather than evolutionary connections.
3. Eliminate another incorrect option: A phylogenetic tree does not show population size over time, as that would be a population growth chart or demographic study.
4. Eliminate the final incorrect option: A phylogenetic tree is not a table listing the classification hierarchy of organisms, which is more akin to a taxonomic chart.
5. Select the correct definition: The best definition of a phylogenetic tree is 'A diagram that represents the evolutionary relationships among different species based on their genetic or morphological characteristics.'