Which type of barrier are coughing and sneezing?

Which flexible structure that supports the nerve cord and led to the backbone

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