Which group represents the greatest number of new hiv cases in sub-saharan africa?

Which of the following occurs after a natural or unnatural disturbance in an ecosystem

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

Which of the following is a good strategy when it comes to desserts