You may be
unfamiliar with the lancelet
shown here, but since
lancelets are animals, what
six things do you know must
be true about them?

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!