Many genes with reproductive roles also have antibacterial and immune functions, which indicate that the threat of microbial attack on the sperm or egg may be a major influence on rapid evolution during reproduction.
A person or object that is regarded as a danger; a menace.
Rooney's United team-mate Chris Smalling was given his debut at right-back and was able to adjust to the international stage in relatively relaxed fashion as Bulgaria barely posed a threat of any consequence.
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