Jon- Your description of air and your definition of mixtures are good. However, we were asked why we believe that air is a mixture. In other words, we were asked for evidence. The sort of facts you cite were not discovered by reading textbooks but by doing real experiments.
Ingroup bias, sometimes known as in-group favoritism, in-groupâout-group bias or intergroup bias, refers to a pattern of favoring members of oneâs in-group over out-group members.This can be expressed in evaluation of others, allocation of resources and many other ways.ngroup bias, sometimes known as in-group favoritism, in-groupâout-group bias or intergroup bias, refers to a pattern of favoring members of oneâs in-group over out-group members.
Attrition bias is a kind of selection bias caused by attrition (loss of participants), discounting trial subjects/tests that did not run to completion. It is closely related to the survivorship bias, which only the subjects that survived a process are included in the analysis.election bias is closely related to: 1  publication bias or reporting bias, the distortion produced in community perception or meta-analyses by not publishing uninteresting (usually negative) results, or results which go against the experimenter's prejudices, a sponsor's interests, or community expectations.