What animals do not have brains?

Question

apart from jellyfish?..its hard to imagine a little bug with a brain. but do they have one?

Answer 1

The one who keeps asking about the girl with the bottle!

Answer 2

bugs have brains, but earthworms don't.

yeah actually that is kind of weird trying to imagine like a fly with a brain or something.. strange.

Answer 3

mussels ?? - guessing!!

Answer 4

jelly fish  

Answer 5

Most animals use a system of specialized cells, called neurons, to help coordinate the activities of different tissues. The exceptions include sea sponges, which are a rather like a loose collection of cells.  Other primitive animals such as jelly fish, do have neurons organized into networks.

While all of these organisms can sense their environment in some way and respond to it, they do not have brains.  Only animals with distinct body cavities possess brains.  This includes life forms as diverse as earth worms, clams, fish, insects, birds, and of course, human beings.  As a general rule, animals with more tissue types have more intricate brains.

Both invertebrate and vertebrate animals can have complex brains.  Of the invertebrates, squid an octopuses have the most developed brains, in part to process information coming from their highly sophisticated eyes.  A medium sized octopus will have a brain containing over 100 million neurons, and can show learning behavior.  

Answer 6

bugs have brains

i think starfish....

ik but there is nothing else i think

Answer 7

YOBS

Answer 8

Chavs

Hoodies

Answer 9

men!

Answer 10

you!!!!!!!

Answer 11

Insects, bugs, spiders and other arthopods, worms, round worms, flat worms, and many parasites do not have a brain.  They have a central ganglia.  Basically a place where all the nerves end together.  It in no way resembles a brain.  Insects basically are driven by chemical signals.  You don't need a brain to survive if you are one of the lower animals.

Primitive sea animals, like the jellies, do not have a brain, just nerves running through their bodies.  Thet also don't have blood.

http://animals.nationalgeographic.com/an...