Dark matter is observed by the gravitational effect that  it has on radiation and the visible universe. The gravitational  force it has from dark matter plays a critical role in the shape of  the galaxies orbit and the because of the hot gases in the groups  of galaxies.
The Angus breed is perhaps the most used, most well-known breed of beef cattle in the U.S. With origins in northeast Scotland, Angus, also known as Black Angus, is popular among Brits and Americans and was first imported to the United States in 1873.
BREEDS OF BEEF CATTLE. Table 1 outlines some breeds of beef cattle that are common in the United States. Each breed is. categorized by frame size, muscling, mature cow weight, milking ability, and some of the more distin-. guishing features of the breed. Frame size is divided into three categories: small, average, and large. Muscle is divided into three. categories: flat, medium, and thick.