Answer:
To measure motion, you must be able to compare it to a reference point, or a non moving point.
C) a system is a set of parts that function together as a whole
<span>Glucose and O2 consumed; CO2, H2O, and energy produced.</span>
Secondary or second-level consumers eat primary consumers. Tertiary or third-level consumers eat lower-level consumers and are sometimes called final consumers. Some secondary and tertiary consumers eat plants as well as lower level consumers, making them omnivores.
