Dose anyone know the answer

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

Crossing over and independent assortment are important activities that occur during meiosis. what is the significance of these activities

This is collection of data made by comparing objects in standard units. in science, the units are metric.