Sentences with phrase «little direct evidence about»

Many researchers agree that shifts in climate and environment shaped human evolution, but there has been little direct evidence about exactly how.

Not exact matches

While little is known about any direct physiological effects of sonar waves on marine species, evidence shows that whales will swim hundreds of miles, rapidly change their depth (sometime leading to bleeding from the eyes and ears), and even beach themselves to get away from the sounds of sonar.

While little is known about any direct physiological effects of sonar waves on marine species, evidence shows that whales will swim hundreds of miles, rapidly change their depth (sometime leading to bleeding from the eyes and ears), and even beach themselves to get away from the sounds of sonar.

The lack of such a trend would say very little about the 1970 - 2005 rise unless it showed some kind of long - period oscillation of the sort Gray seems to wish was there, but evidence of such a cycle would be big scientific news indeed (perhaps as big as any implied direct refutation of Emanuel).

Parental mental illness Relatively little has been written about the effect of serious and persistent parental mental illness on child abuse, although many studies show that substantial proportions of mentally ill mothers are living away from their children.14 Much of the discussion about the effect of maternal mental illness on child abuse focuses on the poverty and homeless - ness of mothers who are mentally ill, as well as on the behavior problems of their children — all issues that are correlated with involvement with child welfare services.15 Jennifer Culhane and her colleagues followed a five - year birth cohort among women who had ever been homeless and found an elevated rate of involvement with child welfare services and a nearly seven - times - higher rate of having children placed into foster care.16 More direct evidence on the relationship between maternal mental illness and child abuse in the general population, however, is strikingly scarce, especially given the 23 percent rate of self - reported major depression in the previous twelve months among mothers involved with child welfare services, as shown in NSCAW.17