The phrase "assumptions existed" is correct and usable in written English.
It can be used when discussing the presence or acknowledgment of certain beliefs or ideas that were held in the past.
Example: "In the early stages of the project, several assumptions existed that later proved to be inaccurate."
Alternatives: "assumptions were present" or "assumptions were made".
These three simple questions generate invaluable insight into what people are thinking, what assumptions exist, what folks are scared about, or excited about, and how we characterize success.
Particularly when violations of the underlying theoretical assumptions exist, consideration of demographic processes (i.e. vital rates, species specific life history strategies and dispersal) and genetic structuring will allow for more appropriate conservation recommendations.
However, little or even conflicting assumptions exist about their putative import and functionality inside the cells.
I guess I am still not sure as to why, truly, these assumptions exist, but I have no doubt that our fetish with money and the dangerous idea that "net-worth = self-worth" is tied to them.
In a cryobiological context, this is much less of a concern but in case it is, special techniques (with their own sets of assumptions) exist to correct for some types of motion artefacts [86], [87] or to quantifiy motion directly (e.g. [88], [89]).
Two seemingly opposing but not necessarily exclusive assumptions exist regarding the mechanism by which XYR1 may govern cellulase expression.
Assumptions exist, which come from a narrow biomedical perspective, that research which does not start from hypotheses, or does not produce one definitive result, or is not generalisable, does not have value and is therefore not appropriate [ 4, 5].
Given the lack of information on this in KSA, formative research through qualitative research methods is needed, as no assumptions exist regarding the reasons behind seeking healthcare, or the lack of care-seeking, among Saudis.
Although the model has been validated against UKPDS datasets and extensive scenario and sensitivity analyses have been performed, several assumptions exist which may have an impact on the robustness of the study outcomes.
There are some documented cases, however, where exceptions to this assumption exist.
