What role does the inner ear play in hearing sounds? * It blocks out unwanted sounds.
O
It converts vibrations into electrical signals.
O It helps determine if a sound is in front of or behind you.
It reflects high and low frequencies back to their source.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

c. 75.7

i think that is the right

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

catya your not at all which answer i've seen you do this on another question!