Stuxnet virus is a malicious computer worm which was discovered for the first time in 2010. Stuxnet is used to target SCADA [Supervisory Control And Data Acquisition] system. It was the one that is responsible for the serious damage to the Iran nuclear power.
People are needed on ground for the stuxnet virus to work because, the virus requires a physical implantation in order to work. Such people are usually expert in detecting the most vulnerable spots in a system.
The respiratory and circulatory systems work with each other in this manner, the respiratory system will obtain oxygen then the circulatory system brings the oxygen to different parts of the body then it also takes carbon dioxide from different tissues of the body and bring carbon dioxide to lungs then the respiratory system takes carbon dioxide outside the body during exhalation
Sun is the correct answer.
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The correct answer is "ovulation" and "corpus luteum" respectively. In ovulation, the egg ruptures from the mature follicle (called the Graafian follicle). This process is preceded by the sudden rise in luteinizing hormone. The follicle now becomes the corpus luteum, actually does not secrete estrogen, it secretes progresterone which prepares the uterine lining for pregnancy.
