Describe the relationship between hiv and the humans who develop these drugs of an evolutionary arms race

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

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?

Which type of respiration takes place when there is no oxygen present