What is this and what is the inner meaning of this

Imagine ? person stepping on a pin and pulling his or her foot way look at the réfléchir arc of the scenarios below

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?