Could the oceans be made of comets hitting the earth when it was made? ?

What causes the phospholipids to organize themselves the way they do

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

Which body region are part of the cephalic region?