2025年1月9日 · Evolution - Species, Speciation, Adaptation: Darwin sought to explain the splendid multiformity of the living world—thousands of organisms of the most diverse kinds, from lowly worms to spectacular birds of paradise, from yeasts and molds to oaks and orchids.

2024年12月21日 · Species, a level of biological classification comprising related organisms that share common characteristics and are capable of interbreeding. According to standard taxonomic conventions, every species is assigned a standard two-part name of genus and species.

K-selected species, species whose populations fluctuate at or near the carrying capacity (K) of the environment in which they reside. Such species make up one of the two generalized life-history strategies posited by American ecologist Robert MacArthur …

Conservation - Endemic Species, Biodiversity, Preservation: To learn what makes centres of human-caused extinctions special, one can ask what are their common features. Obviously, many of these places and their species are well known.

Currently, homosexual behavior has been documented in over 450 different animal species worldwide. For instance, observations indicate that Humboldt, King, Gentoo, and Adélie penguins of the same sex engage in “mating rituals like entwining …

2025年1月9日 · More than 90 percent of the native species of flowering plants, land mollusks, and insects are also endemic, as are two-thirds of the 168 species of ferns. There are more than 500 native Hawaiian species of Drosophila flies—about one-third of …

2024年12月21日 · Researchers are more confident in the counts of some groups of plants, such as trees (of which there are slightly more than 60,000 species), and some groups of animals, such as mammals (of which there are slightly more than 5,500 species).

Coyotes, gray wolves (Canis lupus), domestic dogs (Canis familiaris), and jackals (four Canis species) all belong to the same top seven taxa (domain, kingdom, phylum, class, order, family, and genus). This indicates that these species share many …

2025年1月15日 · Deer, any of 43 species of hoofed ruminants in the order Artiodactyla, notable for having two large and two small hooves on each foot and also for having antlers in the males of most species and in the females of one species. Deer are …

Clostridium, genus of rod-shaped, usually gram-positive bacteria, members of which are found in soil, water, and the intestinal tracts of humans and other animals. Most species grow only in the complete absence of oxygen. Learn more about the different types of clostridia with this article.