Please Help :) Which human activity depletes the ozone layer?

A. planting genetically-modified crops

B. using solar power to generate electricity

C. fighting fires with halon-containing fire extinguishers

D . purifying crude metals by heating them to their liquid state

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 measure of an earthquake depends on how close you are to the focus?

Discuss cell surface transport in the structure of constituents