Q: Q: What process, which results because of great pressure at the center of a star, causes stars to shine? Choices: - gravitational pull - electric fusion - energy fusion - nuclear fusion A:
A: nuclear fusion

Q: Q: Modern plants reflect what kind of changes that have occurred over many, many years? Choices: - unknown changes - tissue changes - tendency changes - evolutionary changes A:
A: evolutionary changes

Q: Q: Scientists often classify or organize different objects based on their what? Choices: - experimental properties - behavioral traits - independent variables - physical properties A:
A: physical properties

Q: Q: Balanced chemical reactions are balanced in what? Choices: - atoms - molecular bonds - electrical charge - terms of moles A:
A: terms of moles