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brain stem is the oldest and most primitive
It depends on what organism you are talking about. Some organisms do not require a brain to "live". Organisms without a brain are usually rather simple and have a limited nimber of functions abailable to them.
A primitive animal is a type of organism that is considered to be simple in structure and function compared to more complex organisms. These animals often exhibit features that are similar to ancestral forms, reflecting an earlier stage of evolution. Examples of primitive animals include sponges and jellyfish.
because if we didnt have them we would all die, because the brain and heart are what keep you alive and they are organisms
Without the nervous system, we would have only primitive, unintelligent organisms such as sponges and jellyfish. There would be no one to post questions or to answer them. This website would fall out of use.
If you can consider space a biome, I imagine that would be the place with the least amount of animals.
The sense of smell can be enhanced by eating healthy and having regular medical check up. The sense of smell usually enhances our ability to taste. The sense of smell usually affects the primitive part of our brain.
There was an ozone atmosphere on primitive Earth, but not an ozone layer which was formed further on. The primitive atmosphere on the surface of the Earth mostly composed by ozone was pushed upwards by the oxygen formed by dead organisms. That primitive ozone atmosphere on the surface of the Earth protected the forming microorganisms from the UV radiation. JamesWest09
To answer this question properly, you would need at least 1,000,000,000,000,000 sentences.
If it's on a test I would say that the answer be multi celled organisms have more cells than single celled organisms.
No, antonyms of primitive would be current, present, modern, new...
The mechanism for evolution that was proposed by Jean Baptiste Lamarck was that organisms began life as primitive forms but adapted to their environment and became more complex forms. He also claimed that as time progressed, new primitive organisms were also occurring, so that they may evolve in the future.