Ions only move across the membrane until there are amounts on both sides of the membrane. This is because ions move from an area of concentration to an area of concentration.

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.

Can you write it in english

Bees shall never produce milk no matter what but this is a joke and the answer is a breast that produces milk.