Intense uv light from the sun is lethal to living things. currently, some 99% of all incoming uv is blocked by the ozone layer which didn't develop until well after the first life-forms. how might the very earliest organisms have avoided the intense uv rays?

Land conservation is a worldwide priority. there are several methods to prevent the loss of land due to a variety of reasons. which method is not a way to conserve land? a) sea walls b) rainwater harvesting c) limits on clear cuts of forests d) cut and burn methods of clearing land