Base changes phenolphthalein to pink it is true or false

Compare and contrast physical changes with chemical changes.

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.

The biosphere of the earth is made up of what compound? organic or inorganic?