How are viruses different from other living organisms?

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

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

What characteristic makes a cell membrane selectively permeable