The hurricane re-strengthened to Category 4 status with maximum sustained winds near 130 mph (210 kph). The U.S. National Hurricane Center said Irma was expected to gain a little more strength as it moved through the Straits of Florida and remain a powerful hurricane as it approached Florida. As of 4 a.m. EDT Sunday, the hurricane was centered about 55 miles (90 kilometers) south-southeast of Key West, Florida, and was moving northwest at 6 mph (9 kph).
An organic compound always contains carbon. A few exceptions are carbon monoxide, carbon dioxide, carbonates, cyanides, cyanates, carbides, and thyocyanates, which are considered inorganic. Examples of organic compounds are carbohydrates, lipids, proteins and nucleic acids.
The four main classes of organic compounds (carbohydrates, lipids, proteins, and nucleic acids) that are essential to the proper functioning of all living things are known as polymers or macromolecules. All of these compounds are built primarily of carbon, hydrogen, and oxygen but in different ratios. This gives each compound different properties.