The mechanical breakdown of rocks by the action of other rocks and sand particles is called

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's

examples of nucleic acids are deoxyribonucleic acid (dna) and ribonucleic acid (rna).