When comparing animal and human red blood cells under the microscope, which characteristic is most like that of animal blood?

it's filtration, but this is an assumption so my apologies if i got this

14 days is the half-life of phosphorus-32

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.