Which of the following statements concerning experiment and explanation is/are true?
1. A law is always given in the form of a mathematical expression.
2. Once a hypothesis passes one or two tests it is considered a theory.
3. Observation is a key component of the scientific method.
A) 1 only
B) 2 only
C) 3 only
D) 1 and 2
E) 1,2, and 3
Answer: C) 3 only