Which of the following statements about the role of phospholipids in the structure and function of biological membranes is correct?
a. phospholipids are completely unable to interact with water
b. phospholipids form a structure in which the hydrophobic portion faces outward
c. phospholipids form a selectively permeable structure
d. they are triacylglycerols, which are commonly available in foods
e. phospholipids form a single sheet in water

Answer;

C. Phospholipids form a selectively permeable structure

Explanation;Phopholipids are types of lipids which are amphipathic molecules, that is they have both non-polar and polar end. They are fundamental building blocks of cellular membranes and are the major part of surfactant.Phospholipids are selectively permeable that is they allow some molecules but not others to pass across it. The phospholipid bilayer is permeable to small polar molecules and nonpolar molecules. They bilayer is impermeable to larger polar molecules and ions.

If these are the missing choices: a. to determine skin temperature, place the back of your hand against the patient's skin.b. determine body temperature by touching the patient's hands and feet.c. skin temperature will tell you very little about this patient's condition or well-being.d. the patient's skin temperature and color will likely be warm and red.my answer is: a. to determine skin temperature, place the back of your hand against the patient's skin. using the back of the hand to check for temperature rather than the palm is more effective because the back of the hand has more nerves that can feel and transmit the temperature than the palm.

Although i don't know what is the simulated system, starfish are predators that eat mostly  microalgae,  snails, sponges, bivalves, mussels and other small marine animals. removing starfish from any system would definitely increase this animals that they prey.