Describe how the successional stages would differ from primary succession.

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 process of living things produces water that enters the water cycle

What is any method of measuring the age of an object or event in years, such as using atomic half-life?