No one has been able to point out what kind, or what amount, of difference in any recognisable character is sufficient to prevent two species crossing.
Now do these complex and singular rules indicate that species have been endowed with sterility simply to prevent their becoming confounded in nature?
Great diversity in the size of two plants, one being woody and the other herbaceous, one being evergreen and the other deciduous, and adaptation to widely different climates, does not always prevent the two grafting together.
Not only shall I not accompany him, but I am here so as to be present at the last moment to prevent
Clem has been with PREVENT
(and its predecessor firm) since 1997.
The neck plays a significant role in football and acts as a shock absorber to prevent
In addition, the backboards contain holes to let water out to prevent
the accumulation of dew.
The number of cases that must be detected by microbiologic screening to prevent
1 secondary case was most affected by varying the number of contacts per patient and the secondary attack rate (Figure).
As part of its campaign, IHI is hoping to get 2,000 hospitals to commit to enact at least one of six steps it believes will prevent
Placing a super-adaptive layer will help prevent
any voids or air pockets in the restoration.
Liquids, emulsions, and/or their dispersants are potential foods for biological activity; therefore, treat stored chemicals with the recommended level of biocide to prevent
Every day about 1,800 babies are born with HIV, mostly to women who have no treatment options either for themselves or to prevent
the infection of their child.