What happens to the cells of cartilage in a growth plate?
a. cartilage cells are replaced by bone cells
b. cartilage cells lengthen to stretch out the bone?
c. cartilage cells expand and become spongy bone cells
d. cartilage cells move into spongy bone as bone marrow
answer asap and thx

Providing immunity by injecting the body with a weakened form a pathogen is known as

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.

Which are evidence of seafloor spreading? check all that apply. molten material magnetic stripes continent material drilled core samples ocean water samples