Some tissues, such as those in skin, are soft. Others, such as bone are harder. How do differences among cells explain this variation in tissue? a. Cell walls grow in hard tissues but not soft ones.
b. Smaller cells arise in softer tissue, while larger cells arise in harder tissues.
c. Cells die in harder tissues and then get pressed into dense solids over time.
d. Cells in one tissue perform a different function from cells in a different tissue.

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?