What is the difference in bones from children to adults

Which is a function performed by stem cells in the skin a. replacing lost skin cells b. making cells for the intestines c. growing new organs d. differentiating into brain cells plz apex

When the oxygen produced by photosynthetic plants in the water dissolves in the water, which of these is being formed?

How does the color of light affect the germination time (amount time a plant takes to develop) of a radish seed?