<h1>CHEMICAL ELEMENTS AND COMPOUNDS</h1> CONTENT <ol> <li>Meaning of Element</li> <li>Elements and their Symbols</li> <li>Names of Elements Derived From the Latin Name</li> <li>Chemical Compound</li> <li>Nature of Elements</li> <li>Mixture</li> </ol>   <h2>Meaning of Element</h2> Elements are substances that cannot be broken down into anything else. Everything in the world are built up from these elements. There are about one hundred and twelve (112) elements known today. Scientists use short forms called symbols to represent elements as shown below. <h2>Elements and their Symbols</h2>

REFUSE AND SEWAGE</strong></h1> CONTENT <ol> <li>Meaning of Refuse and Sewage</li> <li>Methods of Refuse Disposal</li> <li>Cleaning Tools and Agents</li> </ol>   <h2><strong>Meaning of Refuse and Sewage</strong></h2> Refuse is a solid waste whether dry or wet which could cause land pollution e.g. nylon, paper, plastic, broken bottles, scraps, etc. Refuse wastes materials could be divided into 2 namely: biodegradable and non-biodegradable. Biodegradable materials are materials that can decompose or decay e.g. banana peels, dead leaves, dead animals, etc. Non-biodegradable things are materials that cannot be decomposed or decay e.g. metals, plastics, broken bottles, etc. Sewage is a liquid waste from the environment e.g. faeces, urine, wasted water from kitchens, bathrooms, etc. <img class="size-full wp-image-19606 aligncenter" src="https://classhall.com/wp-content/uploads/2018/06/refuse-and-sewage.jpg" alt="refuse and sewage" width="431" height="116" />   <h2><strong>Methods of Refuse Disposal</strong></h2> Refuse disposal methods include:

<h1><strong>ADAPTATION OF ORGANISMS TO THEIR HABITATS</strong></h1> CONTENT <ol> <li>Meaning of Adaptation</li> <li>Characteristics of Organisms Found on Land</li> <li>Characteristics of Organisms Found in Water</li> </ol>   <h2><strong>Meaning of Adaptation</strong></h2> Adaptation means special features that help an organism to live and survive in a particular habitat. Every living thing on earth belongs to one habitat or the other because it is always interacting with some biotic and abiotic components such as energy, water, air (oxygen), food, carbon dioxide and suitable living conditions. For example, there are certain species of plants and animals that can survive only in rain forest habitat and not in the desert and vice versa. <br> <h2><strong>Characteristics of Organisms Found on Land</strong></h2> The following are the characteristics of organisms found on land:

<h1><strong>FAMILY HEALTH - NUTRITION </strong></h1> CONTENT <ol> <li>The Meaning of Nutrition</li> <li>Meaning of Food</li> <li>Classes of Food</li> <li>Balanced Diet</li> </ol>   <h2><strong>The Meaning of Nutrition</strong></h2> Nutrition is the act of obtaining food by living things. It is one of the characteristics of living things. <h2><strong>Meaning of Food</strong></h2> What is food? Food is any substance that is taken to nourish the body and to meet physiological needs for growth, energy and to maintain all processes. <h2><strong>Classes of Food</strong></h2> The food we eat can be grouped into following classes based on the nutrient derived from it. Nutrient is a group of chemical compounds found in food. There are six classes of food, namely carbohydrates, proteins, fat and oil, minerals salt, vitamins and water. <img class="aligncenter wp-image-19608 size-full" src="https://classhall.com/wp-content/uploads/2018/06/classes-of-food.jpg" alt="Nutrition - classes of food" width="346" height="268" /> <h3><strong>Carbohydrates</strong></h3> These are energy giving foods e.g rice, yam, maize, cassava, wheat, bread, potato, etc. Excess intake of carbohydrate foods can lead to diseases such as diabetes, beriberi etc.