Factors such as time of season, soil quality and other environmental variables all contribute to the nutrient content of foods. (naturalchoiceswellness.com)
Stomatal density and stomatal index of many species respond to atmospheric CO2 (Woodward, 1987; Woodward and Bazzaz, 1988) but are influenced by other environmental variables as well (Poole et al., 1996). (ipcc.ch)
«We will be able to study specific gut microbiomes without other environmental variables to consider,» says McCoy, who is the director of the WCMC. (sciencedaily.com)