Speed of sound in air is approximately?

Dengue fever is primarily transmitted by the Aedes aegypti mosquito. This mosquito breeds in stagnant water and is active during daytime, spreading viral diseases such as dengue, Zika, and chikungunya.

Thomas Harriot was an English astronomer who made some of the earliest recorded telescopic observations of sunspots in 1610. His work predates many later astronomers and helped establish systematic solar observation in astronomy.

Qadirpur Gas Field, located in Sindh, is one of Pakistan’s largest natural gas fields and is operated by Oil and Gas Development Company Limited (OGDCL). It plays a major role in supplying natural gas to industries and households.

The Rio Earth Summit, officially called the United Nations Conference on Environment and Development (UNCED), was held in June 1992 in Rio de Janeiro, Brazil. It focused on sustainable development, environmental protection, and climate-related policies.

The smooth endoplasmic reticulum (SER) is responsible for the synthesis of lipids, including fats and steroids. It also helps in detoxification processes and calcium storage, especially in liver and muscle cells.