A) their membranes will crystallize if not in contact with interstitial fluid.
B) an aqueous medium is needed for the cellular exchange of nutrients, gases, and wastes.
C) this prevents the loss of water due to osmosis.
D) their cells need to be protected from dissolved nitrogen gas in the blood.
E) terrestrial organisms have not adapted to life in dry environments.

A) skin.
B) nerves.
C) blood.
D) cuboidal epithelium.
E) smooth muscles.

A) receive their oxygen directly from inhaled air and ingested foods.
B) provide abundant exchange surface.
C) have exceptionally high numbers of cellular organelles in the cytoplasm.
D) offer greater protection due to increased membrane thickness.
E) have a lowered basal metabolic rate due to cooperative exchange between cells.