Some experiments involve two groups what are they called?

Which of the following claims does the author support the least

Sickle cell amelia is a condition condition where the red blood cells are deformed which is affected by sickle cell amenia

Match the correct terms to their descriptions a system in which only energy but not matter is exchanged frozen water in snow part of geosphere that includes only soil a thin layer between the troposphere and the stratosphere cryosphere tropopause closed system pedosphere