The four-field system allows for question 46 options: a. unprecedented population growth. b. minimal land left fallow. c. replaced soil nutrients. d. provided food for animals.

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 is not a likely outcome after extensive irrigation of dry farmland? useless, unproductive soil salinization of the soil depletion of groundwater nutrient-rich soil

Cells are adapted to preform specific functions. which of the following terms refers to this capability?