Which of the following could be considered a scientific principle?
A) Leaves bend toward the light because they sense light is needed to grow.
B) The height of Americans has been steadily increasing over the past 30 years.
C) Radioactive isotopes can be used as tracers in medicine because radioactive isotopes behave the same as other isotopes.
D) Biology is a more exact science than chemistry.

Question

Quizplus · Accepted Answer

Radioactive isotopes behaving the same as other isotopes, except in their radioactive properties, is a scientific principle. This principle underlies their use in medicine as tracers, allowing for the study of biological processes without altering them. Choices A, B, and D are observations or opinions, not principles.

Which of the Following Could Be Considered a Scientific Principle