The recent demonstration that an inadequate supply of iron limits primary production in this region
supports earlier speculation that, in the past, fluctuations in the atmospheric deposition of iron - bearing dust may have driven large changes in productivity.
Not exact matches
«Despite almost a century of psychoanalytic and psychological
speculation, there is no substantive evidence to
support the suggestion that the nature of parenting or
early childhood experiences play any role in the formation of a person's fundamental heterosexual or homosexual orientation.
«Despite almost a century of psy - choanalytic and psy - chological
speculation, there is no substantive evidence to
support the suggestion that the nature of parenting or
early childhood experiences play any role in the formation of a person's fundamental heteros - exual or hom - ose - xual orientation.