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Short answer: jellyfish or various small insects.
If you want a deeper answer, it depends on what you call a brain
because a jellyfish has a nerve cluster which is technically a giant brain
and the insects without brains have what we call: ganglia
it is basically a brain just with no ability to think abstractly;
it just controls basic functions and instincts.
Wiki User
∙ 13y ago
Wiki User
∙ 12y agoI believe that an organism with no heart,bone,or brain is an Ameoba.These animals can only be seen through a microscope and even in the microscope they would be hard to say.They are invisible to the naked eye.I am a 6th grade BRAIN-I-AC!
Wiki User
∙ 11y agoa star fish is a living specie and has no brain!
jellyfish,plankton, sea squirts, trees plants and octopi have no brains
Wiki User
∙ 13y agoi think a dolphin has a pretty big brain defiantly bigger than the human brain, but not sure.
Wiki User
∙ 14y agoJellyfish
Wiki User
∙ 12y agoJellyfish
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Does Mars have brains?
Mars is not a living thing. There might be living creatures on Mars, and they might have brains, but Mars itself does not have brains. If you are asking about the Roman myths, Mars does indeed have a brain.
Is tomato living or nonliving?
A tomato isaliving organisms all things are living organisms. You will be surprised at what are living organisms.
Do living and non living organisms contain cells?
No only living organisms have cells. But non-living organisms are made up of atoms instead.
Function of the cytoskeleton in the cells of living organisms?
function of the cytoskeleton in the cells of living organisms?
What word describes microbes which gain nutrients from once living organisms?
Fungi and Bacteria that gain nutrients from once living organisms are called decomposers. Organisms that gain nutrients from living organisms is called parasites.
Is it possible for an orgnisem to be brainless?
Yes it is there are many examples of living organisms without brains such as single celled bacteria, jellyfish and plants
Do simple organisms have brains?
ganlia
Does Mars have brains?
Mars is not a living thing. There might be living creatures on Mars, and they might have brains, but Mars itself does not have brains. If you are asking about the Roman myths, Mars does indeed have a brain.
Are there more living organisms than non living organisms?
There are no non-living organisms, unless you mean dead organisms.
Living organisms come from other living organisms?
All living organisms have to have a host to create other organisms. This includes micro organisms as well as bacterial organisms
What actors and actresses appeared in Revenge of the Living Brains - 2011?
The cast of Revenge of the Living Brains - 2011 includes: Brad Milne as Actor
How are living cells that are organisms different from living cells that are not organisms?
All living things are organisms. There is no such thing as a living cell that is not an organism.
Do midges have brains?
everything living has a brain
What is the difference between living cells that are organisms and living cells are not organisms?
Single celled organisms are examples of living cells that are organisms. Most other living cells are parts of living organisms, but could not survive long on their own.
Do microbes have brain?
Microbes do not have brains but they are like all the other organisms.
Do living organisms come from other living organisms?
Yes, they do.
The difference between living cells that are organisms and living cells that are not organisms?
single celled organisms
