Which protein do all animals have in common?

COLLAGEN. The exctracellular protein collagen (making the most abundant extracellular protein in animals) which is required in multicellular organisms to keep the cells together, which is exclusive to animals. Most enzymes responsible for metabolic pathways.

Wikipedia aswell can be used to solve the following questions

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.