Organisma in ecosystems exchange energy an dnutrients among themselves and with the environment. Sources of energy and materials differe in amounts, distribution, usefulness, and the time required for their formation. Physical Science 1. Scientific progress is made by asking meaningful questions and conducting careful investigations. The velocity of an object is the rate of change of its position.
Unbalanced forces cause changes in velocity.
Elements have distinct properties and atomic structure. All matter is comprised of one of more of over 100 elements. All objects experience a buoyant force when immersed in a fluid. Chemical reactions are processes in which atoms are rearranged into different combinations of molecules. The organization of the Periodic Table is based on the properties of the elements and reflects the structure of atoms.