D. All other kingdoms, Archaea, Fungi, and Plantae have a cell wall in at least one of their organisms. The animalia kingdom is the only one out of the four that lack a cell wall.
Viruses make us sick by killing cells or disrupting cell function. Our bodies often respond with fever (heat inactivates many viruses), the secretion of a chemical called interferon (which blocks viruses from reproducing), or by marshaling the immune system's antibodies and other cells to target the invader.
<span>Bacteria is needed to convert nitrogen gas/ammonia into nitrates for "enhancing" the growth of plants.</span>
<span>The larger the artery, the more blood flows into it, and the more it has to stretch and recoil as the heart beats. If it wasn't elastic enough, it would burst open and the person would be put in danger. </span><span>Large arteries receive large amounts of blood with a great amount of pressure so the elastic fibers allow these vessels to expand to help this high pressure, then recoil to their original shape to move the blood along.</span>