How is the red blood cell similar to a animal cell

because humans and reptiles and other kind of animals have what's called DNA in nuclei

Explanation:

Like most animal cells, red blood cells from fish, amphibians, reptiles and birds all contain DNA in nuclei, represented by shaded ovals in Gulliver’s drawing. By contrast, the red blood cells of mammals lack nuclei and other internal structures found in most animal cells.

Hope this helps!! :)

the sphincter muscles at the end of the digestive tract is the anus.

not too sure but maybe in the hot springs.