Jss 3 Basic science

^bIn genetics ,when one trait overshadows the other in the offspring ,the overshadowing trait is called the dominant trait while the one that is suppressed is called the recessive trait .

Resources are raw materials provided by nature which are  used by man in the production of finer materials for human survival and well being.Living things serve as raw materials for the survival and welfare of man .They are called biotic or organic resources.Biotic resources could be plant or animal in origin.

The non -living components of the environment include  air , water and minerals. These and most of the  living things are found on or inside the soil.Mineral resources are found under the earth's surface.Such minerals such as gold , silver sulphur etc.

Generally, mineral resources are income earners.They can be sold locally or exported for good income. They can be used in manufacturing industries.Coal is used in generating fuel and heat ,lead is used for making batteries etc.

• MATTER: This is any substance that has mass and occupies space. It is made up of particles called atom and molecules. Matter may exist as elements, compound and mixture. 
• ELEMENT: An element is any substance which cannot be split into two or more simpler units by any known chemical means. Each element contains only one kind of matter which makes it different from other elements. 
• There are over 109 known elements in the world. They are arranged in a table known as the Periodic table. E.g. Iron, Gold, Carbon, Hydrogen, Oxygen, Chlorine etc. Elements are represented with chemical symbol.,

The  sense orga