1)
Scientific theory. All BUT ONE of the statements below describes some aspect of a scientific theory.
A) Once developed, a theory cannot be changed.
B) Many observations and much evidence is needed to develop a theory.
C) A theory reflects an understanding of a particular part of the natural world.
D) Scientists use the scientific method and controlled experiments to collect evidence to develop a theory.

2)
Hypothesis. Theory. Law. What statements below BEST apply to a scientific theory. All BUT ONE statement could apply.
A) Continued observation and research can challenge existing theories.
B) To develop theories, scientists most often rely on an accumulation of knowledge developed over time.
C) A scientific theory is an expression of a mathematical or descriptive relationship observed in nature.
D) A scientific theory may begin with observations and is then substantiated by experimentation and data collection.

1. Scientific theories can change or develop over time. Because of the development of new technology, scientists are able to explore and discover things which were not possible till now. With new discoveries, some theories are changed, refuted, and/or supported by new evidence.

2. An expression of a mathematical or descriptive relationship observed in nature is actually a scientific law and not a theory. A scientific theory is an explanation of a natural phenomenon while a scienific law is a statement about an observed natural phenomenon and it does not delve into why it occurs.