What is the best description of what has happened to flowers when they change color as they mature? a. a formation of a mixture
b. a physical reaction
c. a chemical reaction

Which of the following pairs of elements belong to the same groupa. h and he b. li and bec. c and pb d. ga and ge

About 70 percent of the earth's surface is water-covered, and about 96.5 percent of all earth's water is salt water. identify the watery feature on earth that is made of freshwater rather than salt water. a) bay b) glacier c) ocean d) sea it is not incomplete this is the true question

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.