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Meiobenthos, also called meiofauna, are small benthic invertebrates that live in marine or freshwater environments, or both. The term meiofauna loosely defines a group of organisms by their size—larger than microfauna but smaller than macrofauna —rather than by their taxonomy. This fauna includes both animals that turn into macrofauna later ...
Individual cells within multicellular organisms also show thermotaxis. For example, mammalian sperm migrate through the oviduct to the fertilization site guided by a rise in temperature. [75] [76] The investigation of how unicellular organisms migrate toward preferred temperatures began more than 100 years ago. [74]
Marine protists are defined by their habitat as protists that live in marine environments, that is, in the saltwater of seas or oceans or the brackish water of coastal estuaries. Life originated as marine single-celled prokaryotes (bacteria and archaea) and later evolved into more complex eukaryotes. Eukaryotes are the more developed life forms ...
Copepods (/ ˈ k oʊ p ə p ɒ d /; meaning "oar-feet") are a group of small crustaceans found in nearly every freshwater and saltwater habitat.Some species are planktonic (living in the water column), some are benthic (living on the sediments), a number of species have parasitic phases, and some continental species may live in limnoterrestrial habitats and other wet terrestrial places, such ...
Religious images in Christian theology have a role within the liturgical and devotional life of adherents of certain Christian denominations. The use of religious images has often been a contentious issue in Christian history. Concern over idolatry is the driving force behind the various traditions of aniconism in Christianity .
Trichoplax adhaerens is one of the four named species in the phylum Placozoa. The others are Hoilungia hongkongensis, Polyplacotoma mediterranea and Cladtertia collaboinventa. Placozoa is a basal group of multicellular animals, possible relatives of Cnidaria. [2] Trichoplax are very flat organisms commonly less than 4 mm in diameter, [3 ...
Intermediate minor rankings are not shown. In biology, a kingdom is the second highest taxonomic rank, just below domain. Kingdoms are divided into smaller groups called phyla (singular phylum). Traditionally, some textbooks from the United States and Canada used a system of six kingdoms ( Animalia, Plantae, Fungi, Protista, Archaea ...
Species complex. The butterfly genus Heliconius contains some species that are extremely difficult to tell apart. In biology, a species complex is a group of closely related organisms that are so similar in appearance and other features that the boundaries between them are often unclear. The taxa in the complex may be able to hybridize readily ...