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One hypothesis for the origin of the nucleus in eukaryotes (plants, animals, fungi, and protists) is that it developed from a symbiogenesis between bacteria and archaea. [ 5 ] [ 71 ] [ 72 ] It is hypothesized that the symbiosis originated when ancient archaea, similar to modern methanogenic archaea, invaded and lived within bacteria similar to ...
In the great majority of tunicates, mollusks, and earthworms, hermaphroditism is a normal condition, enabling a form of sexual reproduction in which either partner can act as the female or male. Hermaphroditism is also found in some fish species, but is rare in other vertebrate groups. Most hermaphroditic species exhibit some degree of self ...
Some fish form short term pairs and the French angelfish is thought to pair-bond over a long term. True breeding pairs are quite common in birds . Breeding pair arrangements are rare in mammals , where the prevailing patterns are either that the male and female only meet for copulation (e.g. brown bear ) or that dominant males have a harem of ...
They will stay together until one of the two dies. According to evolutionary psychologists David P. Barash and Judith Lipton, from their 2001 book The Myth of Monogamy, there are several varieties of pair bonds: [2] Short-term pair-bond: a transient mating or associations; Long-term pair-bond: bonded for a significant portion of the life cycle ...
the term "fish" can refer to more than one fish, particularly when the fish are from the same species; the term "fishes" refers to more than one species of fish; Fishing – the activity of trying to catch fish; Fisherman or fisher – someone who captures fish and other animals from a body of water, or gathers shellfish.
This essentially means that the goby will have multiple monogamous relationships throughout its life – but only be in one relationship at a time. [55] The red-backed salamander exhibited signs of social monogamy, which is the idea that animals form pairs to mate and raise offspring, but still will partake in extra pair copulation with various ...
In that case, each partner in a system could benefit from specializing in producing one specific resource and obtaining the other resource by trade. When only two partners exist, each can specialize in one resource, and trade for the other. Trading for the resource requires co-operation with the other partner and includes a process of bidding ...
This is a list of fish with common names that are based on the names of other animals. The names listed here may refer to single species, broader taxa ( genera , families ), or assortments of types. Where names are ambiguous, the various meanings should be listed here.