Which of these animals does not have a brain?
Jellyfish belong to the same phylum as sea anemones and corals. These organisms on the more ancient branches of the evolutionary tree have relatively simple anatomy. In fact, jellyfish consists of about 95% water! Perhaps most remarkable is that they have no brain, heart, or stomach.
Although jellyfish do not have a brain, they have a very basic set of nerves or a nerve net that spreads radially through the jellyfish. These nerves serve as sensory organs that detect touch, temperature, salinity, etc., and the jellyfish react reflexively to these stimuli. Their neurons are interspersed in the various body layers of the jellyfish.
These creatures have sensory organs that recognize light, salinity, gravity, touch, and temperature.
More Info:
www.scienceabc.com
What are your thoughts on this subject?
42 Comments
stevemanning
Sea urchins have no brain!!! Look it up.
pwhelan
I suppose politicians would have been too obvious. :)
Jhan Schmitz
From the internet: Some of the other animals that survive without brains include the sea star, sea cucumber, sea lily, sea urchin, sea anemone, sea squirt, sea sponge, coral, and Portuguese Man-O-War." So, SEA URCHIN IS A CORRECT ANSWER !!!
rkcorrigan
This question has two correct answers. The only reason I got it right is I chose a 50-50 option and sea urchin was eliminated as one of the choices. The correct answerS are either jellyfish or sea urchin.
Tim Tice
Sea urchins also do not have a brain! Bad question!!
wyodinosaur
Another erroneous quiz. Sea urchins have no brain. I really wish Quizclub would screen the questions for accuracy.
darylhopper dh
Lilly wasn't an option 😁?
Chris Brown
Jellyfish function using only sensory nerves. Called “jellies,” this family of translucent creatures is unique. All other creatures without brains tend to be immobile, often spending their entire existence in a single spot. And although sea urchins don't have brains, "it could be their entire nervous system more or less acts as a brain,".
Michael W. Strode
Some of the other animals that survive without brains include the sea star, sea cucumber, sea lily, sea urchin, sea anemone, sea squirt, sea sponge, coral, and Portuguese Man-O-War. A brain is basically what results when a large group of nerve cells called neurons form one large cluster.
Corey Taylor
stevemanning, Neither do half the question writers on Quizzclub!
Jim Mascair
Living without a brain must have some advantages. Jellyfish appear prolific and are not in danger of extinction.
Larry Hughes
Larry Hughes, " Wasn't"
Larry Hughes
Why want congress listed as an option?
fdeisner
I have reported this question with the following statement.
According to the Pacific Aquarium:
Two answers are correct the sea urchin and the jellyfish according to Aquarium of the Pacific.
Sea urchins belong to a group of marine invertebrates called echinoderms, which means spiny-skinned animals. They are related to sea stars, sea cucumbers, and sand dollars. Like their relatives, sea urchins do not have a brain or heart.
I do not understand why any of lilies questions are vetted has she continually has wrong answers or multiple answers that are correct..
I suggest many more of the same needs to be done. Either put it in your own words or just copy and paste the above.
ashmore d
As several people have mentioned, sea urchins have no brain.
Char
After looking where she got the answers we may be wrong not her
Char
bina sarmah, I am going to look it up later as I thought they had brsins
Char
EarindilAO, exactly some gripe over everything.
Char
Linda Shaw, and it's not acceptable
Char
Karin Johansson, exactly my point too with them
Char
stevemanning, that was my choice yet I was mistaking nerves for brains in jellyfish ..oh well learned something
Karin Johansson
EarindilAO, many playing this game can't think outside of the box!