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Is the amygdala the human reptilian brain?

No, the amygdala is not the entire human reptilian brain. However, the amygdala is a part of the brain's limbic system and plays a role in processing emotions, particularly fear and aggression. The reptilian brain refers to the brainstem and cerebellum, which are involved in basic survival functions.


What is the disadvantage of cephalization?

Cephalization has great importance in the evolution. It is considered as great achivement by the animals. Besides its advantages, it has some disadvantages too. The disadvantages of cephalization are 1. The animal cann't see what happening behind its head. 2. Head can be moved upto 180 degree angle in most of the animals including humans. But it is not true in case of birds.


Why is the lack of cephalization not a disadvantage for a see star?

The lack of cephalization in sea stars is not a disadvantage because they possess decentralized nerve nets that allow them to coordinate movement and respond to their environment effectively. Their radial symmetry also aids in this coordination. Additionally, their specialized tube feet help them to navigate and capture prey without the need for centralized brain control.


What are four characteristics that complex animals tend to have?

Complex animals tend to have specialized cells, bilateral symmetry, cephalization, and a body cavity.


Why is the brain called reptilian?

The brain is referred to as reptilian because it consists of structures that are evolutionarily older and are similar to those found in reptiles. These structures are responsible for basic survival functions such as breathing, heart rate, and fight or flight responses.