Scientific Principals “What’s Going On Inside Me?” All living things share certain characteristics: growth, reproduction, metabolism and response to stimuli. All living things are made of cells; come are single cells and others are multicellular containing trillions of cells. In multicellular organisms, cells organize into tissue, organs and systems that perform specific functions. For the body to use food for energy and building materials, it must be broken down into molecules and transported to the cells. In cells, there is a chemical reaction involving glucose and oxygen that releases energy. Cells use food for building materials and energy. Body systems provide cells with basic need such as food, oxygen, and waste removal. The human body is a system Cells carry out functions like growing, reproducing, getting energy from flood, and responding to stimuli. Cells are living things. The nervous system coordinates all other body system.

Scientific Principals “How Can I Smell Things From A Distance?” Air has mass and volume. Matter is anything that has mass and volume. Matter can exist in three states (or phases): solid, liquid & gas. The state (or phase) of matter can be changed by temperature. Gas does not have a definite shape or volume and can be added and removed. Gas can be compressed and expanded. Gas is made of particles and empty spaces are in between each particle of air. All matter is made of particles. Particles in a gaseous stage ban move. Different arrangement of atoms into molecules result in different properties. Elements have different properties because they are made up of different types of atoms. Molecules can be made of the same type of atoms or different types of atoms. Air is a mixture of different molecules. Different arrangement of atoms into molecules results in different properties.

The higher the temperature the faster the molecules results in different properties. Temperature is a measurement of the average speed of molecules. As temperature increases, the volume of gas increase. As temperature decreases, the volume of gas decreases.. Evaporation occurs when molecules at the surface of a liquid gain enough energy to enter the gaseous state. Doling occurs at the temperature in which molecules throughout the liquid change to the gaseous state, The boiling point is the temperature at which the change of state from liquid to gas occurs. Condensation occurs when water vapor in the air slows down sufficiently to become a liquid. When a substance is heated, the molecules that make up that liquid move faster. The faster movement of the molecules results in higher temperatures. In a solid, molecules stay in place and can only vibrate. Melting is when a substance changes form a solid state into a liquid state. The opposite process is called freezing. Melting pint is the temperature at which a solid substance starts to become a liquid. Melting point is a property of a substance. Sublimation is when a substance changes for the solid state to the gaseous state.