Across
- 3. radiation the diversification of a group of organisms into forms filling different ecological niches.
- 5. Parallel evolution is the independent evolution of similar traits, starting from a similar ancestral condition. Frequently this is the situation in more closely related lineages, where several species respond to similar challenges in a similar way.
- 8. structure A homologous structure is an example of an organ or bone that appears in different animals, underlining anatomical commonalities demonstrating descent from a common ancestor. In other words, it's when very different animals have bones that appear very similar in form or function and seem to be related.
- 9. embryology Comparative embryology is the branch of embryology that compares and contrasts embryos of different species. It is used to show how all animals are related. Many things are compared (such as whether or not the organism has a notochord or gill arches).
- 11. evolution Divergent evolution is the process of tracing back two or more species to their common ancestor. This indicates how these species have diversified and diverged. For example, a flock of bird in migration gets divided as half of them settled to a new island while the other half continued migrating to a farther land. Over time, the two groups become more adapted by developing new characteristics to enable them to survive to their new habitats. Thus, they become a different species to their ancestors and what was once one species has diverged into two.
Down
- 1. n taxonomic kingdom comprising all living or extinct animals. Synonyms: animal kingdom, kingdom Animalia Type of: kingdom. the highest taxonomic group into which organisms are grouped; one of five biological categories: Monera or Protoctista or Plantae or Fungi or Animalia.
- 2. selection the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin, and it is now regarded as be the main process that brings about evolution.
- 4. the process by which different kinds of living organism are believed to have developed from earlier forms during the history of the earth.
- 6. the remains or impression of a prehistoric plant or animal embedded in rock and preserved in petrified form.
- 7. evolution In evolutionary biology, convergent evolution is the process whereby organisms not closely related (not monophyletic), independently evolve similar traits as a result of having to adapt to similar environments or ecological niches
- 10. a country, state, or territory ruled by a king or queen.