Which is the best example of water regulating an organism’s body temperature? a jogger sweating after a run a fish passing water over its gills a deer taking a drink from a stream a leaf using water for photosynthesis

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled