2006-10-30 13:41:20 · 14 answers · asked by Sugarloaf 2 in Science & Mathematics ➔ Zoology
Mammals are the only animals that have an anus--an opening solely for excretory purposes. Birds, reptiles, amphibians, fish, and invertebrates have multi-purpose openings or non-sphinctered openings.
2006-10-30 16:06:57 · answer #1 · answered by candy2mercy 5 · 0⤊ 0⤋
a hydra does not have an anus, per se. It has a gastric cavity with one opening that functions in ingestion and waste elimination.
2006-10-30 14:08:34 · answer #2 · answered by lexibabe2468 2 · 0⤊ 0⤋
Echinoderms don't (starfishes, sea cucumbers, sea urchins, etc.); neither do Coelenterates (jellyfishes, sea anemones, corals). They have a closed, sac-like digestive system, and wastes come out through the same opening where food goes in.
2006-10-30 14:45:25 · answer #3 · answered by PaulCyp 7 · 0⤊ 0⤋
Actually I think a sponge uses it's mouth for eating and disposal
2006-10-30 13:48:30 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Yes. It explodes a week or so after birth but appears to be completely immune to AIDS.
2006-10-30 13:48:39 · answer #5 · answered by Anonymous · 1⤊ 0⤋
i need to go back to school to get on the same level as some of the people answering this question!
2006-10-30 17:18:27 · answer #6 · answered by sweetie 2 · 0⤊ 0⤋
Yes, the inferior protostomades.
2006-10-30 13:43:22 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Yes, frog as the term is different.
2006-10-31 12:17:55 · answer #8 · answered by moosa 5 · 0⤊ 0⤋
I would search among the coelenterata, radiata & other invertebrate ocean creatures.
;-)
2006-10-30 13:50:34 · answer #9 · answered by WikiJo 6 · 0⤊ 0⤋
birds no not have an anus...instead they have a cloaca
2006-10-30 14:46:40 · answer #10 · answered by Anonymous · 1⤊ 0⤋