I Need Help!!! Why is the human body considered an open system?

Plz answer in 5 sentences so I can get the just.

What is the correct term for living the most sustainable life you can within your current circumstances?

How do dying stars contribute to the formation of planets

Which of the following is a conclusion that resulted from ernest rutherford’s scattering experiment? (will mark brainliest) a. the nucleus is negatively charged b. the atom is a dense solid and is indivisible c. the mass is conserved when atoms react chemically d. the nucleus is very small and the atom is mostly empty space