What is the most common cause of collisions boating?

Which statements are true of a scientific theory but not a hypothesis

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

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above