Roots are operations that reverse powers. The square root of a number is the value which, when multiplied by itself, […]

Pollution Pollution is the introduction of harmful substances or energy into the environment. Air, water, land, noise, and thermal pollution […]

Sources of water Water is obtained from rain, rivers, lakes, springs, wells, boreholes, and reservoirs. Groundwater is often filtered naturally […]

Basic ecological terms Ecology is the study of relationships between organisms and their environment. A habitat is the place where […]

Meaning of first aid First aid is the immediate, temporary care given to an injured or suddenly ill person before […]

Male reproductive system The testes produce sperm cells and testosterone. The sperm ducts transport sperm, glands add fluid to form […]

Importance of housing A house provides shelter, privacy, security, storage, and a place for rest and family life. A healthy […]

Importance of clothing Clothing protects the body from cold, heat, sunlight, rain, dust, and injury. It also supports modesty, cultural […]

Food hygiene Food hygiene includes the practices used to keep food safe from contamination and spoilage. Contamination may be biological, […]

Animal-cell organelles An animal cell is the smallest structural and functional unit of the body. The plasma membrane controls exchange […]