Phytoplankton consists mainly of single-celled algae. They live in aquatic ecosystems and conduct photosynthesis. Which is the role of phytoplankton in an ecosystem?​

The higher you go up the less oxygen there is 

Many archeologists and anthropologists disagree with dr. thorne's view.  thorne strongly believes that what many calls "homo erectus"  was in fact  homo sapiens,  and that they migrated out of africa almost 2 million years ago and dispersed throughout europe and asia. that's way different  from what scientists have always believed about the evolution of the species.