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Mahoor Kiani

Types of energy Kinetic energy is motion––of waves, electrons, atoms, molecules, substances, and objects. Potential energy is stored energy and the energy of position––gravitational energy.

Parmis Dalili

Physical change and chemical change Changes in the size or form of matter are examples of physical change. Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances

Liana Sadeghi

Animals habitats In ecology, the term habitat summarises the array of resources, physical and biotic factors that are present in an area, such as to support the survival and reproduction of a particular species.

Kourosh Taheri Moghaddam

Animals habitats In ecology, the term habitat summarises the array of resources, physical and biotic factors that are present in an area, such as to support the survival and reproduction of a particular species.

Samyar Hasan Pour

Skeletal System The human skeleton is the internal framework of the human body. It is composed of around 270 bones at birth – this total decreases to around 206 bones by adulthood after some bones get fused together.

Samyar Hasan Pour

Digestive system   Digestive system The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion. Digestion involves the breakdown of food into smaller and smaller components, until they can be absorbed and assimilated into the body.  

Niki Ebrahimian

Skeletal System All the bones in the human body together are called the skeletal system. The skeletal system provides strength and rigidity to our body so we don’t just flop around like jellyfish.