Packed red blood cells consist of red blood cells that are separated from the rest of the blood components and are used for transfusion.
When the hemoglobin of a person falls below 70–80 g/L (7–8 g/dL), then the person is usually transfused with packedRBC.
In the given situation, the client has chronic kidney disease and congestive heart failure and as a result of this, the hemoglobin levels of the client has fallen down 6.5 g/dL (65 g/L) and thus, there is an immediate need for the provider to perform a transfusion of packed RBC of appropriate blood type as RBCs are a carrier of hemoglobin in the body.
I believe studying the hydrosphere would be most important because we haven't explored a good majority of it yet so we need to explore our waters before we explore space
Genetic conditions such as trisomy (three chromosomes) or monosomy (only one chromosome). They can also determine the fetus' gender by looking at the XY / XX chromosomes.