Against because it may contain chemicals
What? may you explain what the problem is? also may you mark this brainiest for free pls? :)
B.
The frequency of the vibration is above the normal human auditory range.
Normal audible range is from 20 hertz(cycles per second), to 20,000 Hz
As we age it is the higher frequencies we lose.
Answer:
Answer:
True.
Explanation:
A more practical use of constellations was for agriculture. Before calendars were invented farmers relied on the stars to determine when to sow and harvest their crops. Constellations made the patterns of the stars easy to remember. ... Constellations allowed farmers to plan ahead.
