No. Whilst most animals have a brain, there are many that only have a small central nervous system that has no real locus that could be called a brain. Single celled organisms are a prime example as are some microscopic marine life. There are also animals that have no central nervous systems, such as oysters, and some that have no nervous systems at all. All mammals have a brain however.
A jellyfish & a starfish A Jellyfish has no brain & no heart A starfish has no brain & no blood
No, the myth that animals only use a small percentage of their brain capacity is false. Different parts of an animal's brain are active during various tasks, and they utilize their entire brain for survival, movement, and cognitive functions.
When going from lower to higher animals a larger proportion of the brain is devoted to the cerebrum. The brain stem is made up of medulla and the cerebellum.
Some examples of big animals with relatively small brains are elephants, blue whales, and sperm whales. These animals have massive bodies, but their brain size in proportion to their body size is smaller compared to other animals.
Mice that are trying to Take over the world
no animals have a brain even dinosaurs do
brain brain brain
Both animals and humans do have reward centers in the brain. Both humans and animals feel happy or pleasure when the reward centers of the brain are stimulated.
cockroaches
no
My brain lets me speak and form sentences.
Some animals, such as those in the genus Hydra, don't actually have a brain per se, making it difficult to answer.
No, not every animal needs a brain. A jellyfish does not have a brain, it barely has any organs.
Microscopic animals
No.
A jellyfish & a starfish A Jellyfish has no brain & no heart A starfish has no brain & no blood
Bigger brain = smarter Smaller brain = dumber Monkey has big brain, can use tools to get food etc. Bird has peanut sized brain, eats already dead animals instead of finding it's own.