A: On 12 September 2001, less than 24 hours after the terrorist attacks against the United States, NATO declared the attacks to be an attack against all NATO member countries within the terms of Article 5 of the North Atlantic Treaty.
Humans have an additional pair of sex chromosomes for a total of 46 chromosomes. The sex chromosomes are referred to as X and Y, and their combination determines a personâs sex. Human females have two XX chromosomes while males possess an XY pairing.
In females, chromosome pair 23 is two X chromosomes. For males, pair 23 is one X and one Y. The X is much larger and contains around 2,000 genes. The Y is quite small and only has about 86 genes that make about 23 proteins, which basically say be male.