Which characteristic promoted the utilization of lipids as the first cell membrane?

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

Anormal appearing couple is found to be heterozygous recessive for albinism both have the genotype aa the gene responsible for albinism is recessive to the normal pigment-producing gene what are the changes of their children being albino

Which zone within the open-ocean zone is home to the most organisms? deep zone surface zone intertidal zone transition zone