Several speculative and yet untested hypotheses suggest that endogenous DMT is produced in the human brain and is involved in certain psychological and neurological states.

Several other hypotheses that propose a coadaptive reason for the evolution of genomic imprinting have been proposed.

Several hypotheses have been advanced, including links to ornithodirans like Scleromochlus, an ancestry among the basal archosauriforms like Euparkeria, or among the prolacertiformes ( which include gliding forms like Sharovipteryx ).

Several commentators have observed that the propositions " All ravens are black " and " All non-black things are non-ravens " suggest different procedures for testing the hypotheses.

Several hypotheses have been advanced to explain the origin of the name Sarmizegetusa.

Several other hypotheses have been proposed to explain ball lightning:

Several hypotheses have been offered for this asymmetric shape.

Several hypotheses, illustrated below, have been presented to explain seed plant evolution.

Several tentative hypotheses have been suggested.

Several hypotheses have been put forward about the meaning of The Creation of Adams highly original composition, many of them taking Michelangelo's well-documented expertise in human anatomy as their starting point.

Several hypotheses aim toward answering these questions.

Several hypotheses regarding human evolution integrate the idea that human females increasingly required supplemental paternal investment in their offspring.

Several hypotheses for this association have been advanced, including common genetic factors and dopamine, glutamate or serotonin abnormalities.

Several hypotheses try to explain the origins of muscle dysmorphia.

Several different hypotheses have been called " gateway " theories in popular discourse.

Several hypotheses exist on the true nature of the flush.

Several hypotheses are suggested to explain their occurrence.

Several experiments have tested these hypotheses in both the field and the lab.

Several hypotheses have been proposed as to how hystricognath rodents colonized this island continent.

Several organizations, such as the American Association of Variable Star Observers and Center for Backyard Astrophysics, exist to help coordinate these contributions.

Several possible causes exist for these patterns of neurological dysfunction.

Several major cities exist either in the Andes or in the foothills, among which are Bogotá, Medellín and Cali, Colombia ; Quito, Ecuador ; Mérida, Venezuela ; La Paz, Bolivia ; Santiago, Chile, and Cusco, Peru.

Several offences of assault exist in Northern Ireland.

Several molecular mechanisms of antibacterial resistance exist.

Several ways of implementing this exist, and hot-wire devices can be further classified as CCA ( constant-current anemometer ), CVA ( constant-voltage anemometer ) and CTA ( constant-temperature anemometer ).

Several concepts that provide alternative definitions for the reaction mechanisms involved and their application in solving related problems exist.

Several allotropes of boron exist: amorphous boron is a brown powder and crystalline boron is black, extremely hard ( about 9. 5 on the Mohs scale ), and a poor conductor at room temperature.

Several substyles exist, including maibock or helles bock, a paler, more hopped version generally made for consumption at spring festivals ; doppelbock, a stronger and maltier version ; and eisbock, a much stronger version made by partially freezing the beer and removing the water ice that forms.

Several rating scales for the screening and evaluation of bipolar disorder exist, such as the Bipolar spectrum diagnostic scale.

Several methods exist to compute the value of without actually expanding a binomial power or counting k-combinations.

Several Hui restaurants serving Chinese Islamic cuisine exist in Los Angeles.

; Epiphenomenon / zombie reply: Several philosophers argue that consciousness, as Searle describes it, does not exist.

Several transcriptions exist.

Several different techniques exist to study cells are

Several dialects of West African English exist, with a lot of regional variation and some influence from indigenous language.

Several incomplete sets of this form of croquet are known to exist, and one complete set is still used for demonstration games in the West of Scotland.

Several free and open source animation software applications exist as well.

Several versions exist, though they all have the same basic premise, that of a set of instructions given by the Great Goddess to her worshippers.

Several kinds of cytochrome exist and can be distinguished by spectroscopy, exact structure of the heme group, inhibitor sensitivity, and reduction potential.

Several variants of democracy exist, but there are two basic forms, both of which concern how the whole body of citizens executes its will.

Several laboratory scale techniques for distillation exist ( see also distillation types ).

Several products exist to support such databases.

Several normal forms exist with different properties.