Because in science, "theory" doesnt mean what it means in everyday language. Scientific knowledge is known as theory. For example, electrical theory, germ theory, evolutionary theory, thermal theory, etc
The answer is C. It's kind of like how humans speak in different languages. So do birds. They may make different noises but they are all still birds.
Answer:
Bone repair uses the same formation patterns as bone development
The Respiratory organ system
Unlike would fossil fuel burn without releasing energy
