11 MAR 2019

11 MAR 2019

11 MAR 2019

11 MAR 2019

11 MAR 2019

9 LUG 2018 · Living organisms use matter and energy to create a wide variety of organic molecules (e.g., proteins, carbohydrates, lipids and nucleic acids) and to allow life to happen in growth, reacting to the environment, reproduction and movement. Ecosystems also recycle many materials, such as water, carbon and nitrogen.

9 LUG 2018 · How many organisms are in an ecosystem and where they are is limited by how well the ecosystem recycles materials and by how much food, water, space and shelter is available.

9 LUG 2018 · By making observations about the world, experiments can be designed that test for a dependent variable, which depends on the independent variable (that the scientist controls).

9 LUG 2018 · Biological classification represents how organisms are related with species being the most specific part. Biologists arrange organisms into a hierarchy of groups and subgroups based on similarities and differences, which have to do with how closely related they are

9 LUG 2018 · Science is a method of investigation, based on observation, testing hypotheses, measurement, experimentation, and creating theories. This leads to better explanations of the way the world works.