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Population ecology studies the dynamics of species populations and how these populations interact with the wider environment. [5] A population consists of individuals of the same species that live, interact, and migrate through the same niche and habitat. [49]
[12] 2000–2009 saw approximately 17,000 species described per year. [12] The total number of undescribed organisms is unknown, but marine microbial species alone could number 20,000,000. [ 12 ] For this reason, the number of quantified species will always lag behind the number of described species, and species contained in these lists tend to ...
Population: Groups of organisms of the same species: Guild: Interspecific groups of organisms carrying the same ecological function (i.e. herbivores). Community (or biocoenosis) Guilds from all biological domains, and their interactions in a specific location. Ecosystem: Groups of organisms in conjunction with the physical environment. Biome
The list of organisms by chromosome count describes ploidy or numbers of chromosomes in the cells of various plants, animals, protists, and other living organisms.This number, along with the visual appearance of the chromosome, is known as the karyotype, [1] [2] [3] and can be found by looking at the chromosomes through a microscope.
Herbivores and carnivores are examples of organisms that obtain carbon and electrons or hydrogen from living organic matter. Chemoorganotrophs are organisms which use the chemical energy in organic compounds as their energy source and obtain electrons or hydrogen from the organic compounds, including sugars (i.e. glucose), fats and proteins. [2]
[11] [12] Their contributions shaped ancient Greek natural philosophy. [13] [11] [12] [14] [15] Ancient Greek philosophers such as Aristotle (384–322 BCE) contributed extensively to the development of biological knowledge. [16] He explored biological causation and the diversity of life. His successor, Theophrastus, began the scientific study ...
Related to biological pest control is the technique of introducing sterile individuals into the native population of some organism. This technique is widely practised with insects : a large number of males sterilized by radiation are released into the environment, which proceed to compete with the native males for females.
The 67,000 described species range in size from Stygotantulus stocki at 0.1 mm (0.004 in), to the Japanese spider crab with a leg span of up to 3.8 m (12.5 ft) and a mass of 20 kg (44 lb). Like other arthropods , crustaceans have an exoskeleton , which they moult to grow.