[!lemma=a | tag=PRP] [□] □
[!lemma=a | tag=PRP] [□=□] □
[!lemma=a | tag=PRP] [!□] □
Estimates indicate that children in the United States spend 10 to 15 fewer hours of time with their parents than they did in the l960s . Finally , GlobFaV aims at ensuring that higher levels of production do not compromise food quality and safety . These results indicate that caution should be taken when making the assumption that higher levels of presence implies improvement in task performance in virtual environments . Irrigation is needed mainly in the drier parts of Canada , such as the southern regions of Alberta , British Columbia , Saskatchewan , and Manitoba . In addition , we show that higher levels of regulation are associated with weaker legal institutions and a higher probability of contact with a private protection organization . During periods of high atmospheric CO2 , plants can have lower numbers of stomata , and so lose less water while maintaining the same rate of CO2 uptake . It was originally a military order for the purpose of supporting military government ( for such were all governments founded in conquest ) ; and to keep up a succession of this order for the purpose for which it was established , all the younger branches of those families were disinherited and the law of primogenitureship set up . A main result is that higher levels of centralization and conservativeness induce government to set higher labour taxes if the replacement ratio and the tax wedge are sufficiently small . The current situation of relatively good rainfall through April in many wheat areas , excess pasture land , the opportunity to recoup 2002 drought losses and the likelihood of receiving rainfall in the drier parts of the grain belt before late June point to a record wheat area .