The element copper has naturally occurring isotopes with mass numbers of 63 and 65. The relative abundance and atomic masses are: 69. 2% for a mass of 63
30. 8% for a mass of 65.

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.

they vary. it used to be meat, grain, bread, candy, beverages, donuts, and fruits/vegetables. now they added exercise in.

the answer is 0.8m.

by: nicholas