What does it mean if you set a world record?

What came first egg or chicken? and is tomato a vegetable or a fruit?

Which was most likely an effect on society that resulted from improvements in blood handling during world war i and world war ii?

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