What causes tendrils on a vine to curl around a support structure

a) the vine requires a greater supply of carbon dioxide so it grows more tendrils to absorb more carbon dioxide

b) the force repulsion due to gravity causes the vine to grow higher above ground

c)the sun stimulates the plant tendrils to grow around a support structure

d) chemical changes in the vine's cells are activated by touch

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.