An equal number of protons and neutrons in an atom typically results in an atom that is radioactively stable.
Because it allows only certain substances to permeate. If it was totally permeable that would be good enough to having no barrier as it would let everything though. Totally impermeable means that nothing would get through.
Oliguria is the medical term for a decreased output of urine.
Answer: a
Explanation: cel walls have thick and rigid structure with a fixed shape while cell membranes have a thin and delicate structure