What is the primary source of energy for food chains in an ecosystem

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

When a doggo starts to pace around in the same line for a hand full of days. what would that mean?

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