Across
- 5. Comparing external appearance and internal structure (or anatomy) is key to determining the interrelations that exist among organisms, especially animals and plants
- 8. It is the process by which species change steadily over hundreds of thousands of years, giving rise to new species.
- 9. It is the discipline that establishes the evolutionary relationships among different groups of organisms.
- 10. The role life forms play in ecosystems—whether they are primary producers, consumers, or decomposers—is also a criterion for phylogenetic classification.
- 12. Comparing the chemical composition of the substances that make up the cells of organisms is another way of obtaining useful information about interrelations among species
Down
- 1. By comparing present life forms to fossilized remains of similar life forms, hypotheses about evolutionary interrelations can be proposed, as can a time frame for the interrelations
- 2. Comparative analysis of genetic material at a molecular level allows scientists to determine the degree of relatedness among species
- 3. These are tree-like diagrams in which the end of each tree branch corresponds to a species, and each node on the tree represents a common ancestral form.
- 4. By comparing the embryonic development of different species of animals and plants, scientists can determine degrees of relatedness among them
- 6. Cell type (prokaryote or eukaryote), the characteristics of cell components (cell wall, chloroplasts, etc.), the level of organization (unicellular or multicellular), and the degree of specialization (in specialized tissues and organs) allow us to form broad groups among living organisms.
- 7. Plural form of criterion
- 11. Comparing the way in which organisms carry out life processes—nutrition, reproduction, life cycle, etc.—allows us to detect evolutionary relationships among them ecological the role life forms play in ecosystems—whether they are primary producers, consumers, or decomposers—is also a criterion for phylogenetic classification