I believe it is actually false. It dropped from 5 to 2.4. Hope it helps!
Convection keeps the earths surface warm
Unicellular organisms excrete waste by a contractile vacuole. A vacuole is membrane-enveloped organelle in a cell that is found in lots of microorganism. It expands, filling with water then contracts, removing all of its contents to the exterior of the cell.
What does your question mean?
