<span>d. cysts in feces
it can enter human body via </span><span>contaminated foods and water</span>
<span>carbohydrates and lipids.</span>
Humans have microscopic subunits in the kidneys called <span>nephrons to filter blood, and spiders have </span><span>Malpighian</span><span> tubes to absorb salts and wastes. Hope this helped! :)</span>
E. coli bacteria would not have a well defined nucleus, because bacteria are prokaryotic cells.
The onion cell and the human brain cell would be eukaryotic cells, which do have nuclei.