The primary care provider who can approve or deny when a patient seeks additional care is referred to as a(n)

Gatekeeper
   A doctor or a medical health professional who deals with a patient's sickness and it's related administrative services so as to be able to arranges referrals, and helps control medicinal services costs by screening out pointless administrations; A lot of health insurance companies requires the approval of such a specialist so that the know that the claims of the sick person are justified

Idont know but good luck; )

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem