C. Hardness is the answer
I think from the above answers the most appropriate is that GPS technology has led to development of robotic tractors for planting, fertilization, and crop harvesting. The global positioning system has found a wide and beneficial use in agriculture, it is used for mapping yields, variable rate planting, variable rate lime and fertilizer application, field mapping for records and insurance purposes among other uses.
All of them performs a function similar to that of the human body's skin!
Answer:
the volume increases in amplitude of the sound wave. Pitch is seen as a change in the frequency
Explanation:
is this what you were asking for?