13. What is the most significant difference in current weather forecasting methods compared to what was done in the past? A. more accurate computer based weather models

B. improved weather instruments

C. better TV and radio weather communications

D. more weather stations reporting data

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