Testable and Observable:

* Empirical: Science relies on evidence gathered through observation and experimentation.

* Falsifiable: Scientific theories must be able to be proven wrong, meaning there must be potential observations that could contradict the theory.

* Repeatable: Experiments and observations should be able to be replicated by others to ensure reliability.

Examples of questions science can answer:

* What is the chemical composition of water?

* How do plants photosynthesize?

* What causes the Earth's seasons?

* How does gravity work?

* What is the lifespan of a star?

* What are the effects of climate change?

* How can we develop new vaccines?

Science cannot answer:

* Subjective questions: Questions that rely on personal opinions, beliefs, or values (e.g., "What is the meaning of life?").

* Questions about the supernatural or unobservable phenomena: Questions that cannot be tested or observed through scientific methods (e.g., "Does God exist?").

* Questions that require moral or ethical judgments: Science can provide information about the consequences of certain actions, but it cannot dictate what is right or wrong (e.g., "Is abortion morally acceptable?").

It's important to note:

* Science is an ongoing process of exploration and discovery. Answers to scientific questions can change as new evidence emerges.

* Science is not about proving things; it's about finding evidence to support or refute hypotheses.

Therefore, science is a powerful tool for understanding the natural world, but it has limitations.