Can someone help me please answer these questions about the disease called rickets.

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 produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above

What is the average speed of a car that traveled 300.0 miles in 5.5 hours