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i've always considered the membrane like our skin. our skin keeps things in and out as well, but it does not control us the same way our brain does. so, i think the nucleus is the brain.
Strange question. Brain is made of cells. Therefore collection of cells can be identified as brain. The brain of the dnosaurs t-rex was of the size of nut. When talking about single cell .. I wonder how one can define brain?
Not all dinosaurs had minuscule brains. In relation to their body mass, ceratopsians had relatively large brains, as did such theropods as the dromaeosaurids. Dromaeosaurids, in fact, are considered to be the smartest of dinosaurs, and they were probably at least as intelligent as the Emu (a modern, ostrich-like bird).
T. rex was a relatively smart dinosaur. Although the ratio of brain size to body mass was very small for T. rex, it was larger than most other dinosaurs. T. rex's brain was larger than the human brain, but the cerebrum (the part of the brain that we use to think) was tiny. T. rex's brain was long and almost cylindrical in shape.Only very advanced theropods, like the dromaeosaurid dinosaurs (for example, Deinonychus and Velociraptor), were probably smarter than T. rex.T. rex probably ranked close to the carnosaurs in intelligence.