The placenta.
the solvent
The chorionic membrane is the outer sac which surrounds the developing fetus
The rind is colored with annatto
Cytoplasm
a thick layer of a skin like substance called fad
cerebrospinal fluid
Respiration ;)
Phagocytosis.
Exocytosis.
exocytosis
exocytosis
A cell membrane is a substance that surrounds a cell. hope this helped! :P