If a person is not able to show stress in dangerous situations and lacks fear, there might be issues with an area of their brain known as the amygdala.
The amygdala is an almond-shaped structure which can be found in the medial temporal lobe of the brain, right in front of the hippocampus. It is a region of the brain which primarily deals with regulating our emotional processes like fear response but is also responsible for other strong emotions like aggression and pleasure. In case the amygdala gets damaged, it impairs the emotional memories of the person and also results in poor decision making. 
To learn more about amygdala here
brainly.com/question/14397911
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Answer:Carbon dioxide molecules
Explanation:
 
        
             
        
        
        
The Tassie Devil has held this title for over 80 years. Prior to 1936, the largest carnivorous marsupial in the world was the thylacline, which is commonly know as the Tasmanian Tiger. The thylacline is a distant relative of the Tasmanian Devil and was over the twice it’s size!
A mother gives birth to around 20-40 Joeys at once. However, these joeys have to race to her pouch, which only has 4 teats. Talk about a hard start to life!
Although the yawn is more a display of fear and anxiety than aggression.
 
        
             
        
        
        
Answer:
Robert Hazen’s studied enviromental and biological processes that might have been critical for life, and also for the formation of approximately two-thirds of Earth's mineral species (see Hazen et al., 2008; Gonzalez & Richards 2020)
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Explanation:
Hazen provided evidence about how first organic molecules were generated on the primitive earth millions of years ago. He observed that high-pressure hydrothermal vents may provide food for underwater ecosystems. It represents a piece of critical evidence on the origin of life.
You can read these articles that are certainly clarifying in the description of his experiments and discoveries:
1- Hazen, R. M., Papineau, D., Bleeker, W., Downs, R. T., Ferry, J. M., McCoy, T. J., ... & Yang, H. (2008). Mineral evolution. American Mineralogist, 93(11-12), 1693-1720.
2- Gonzalez, G., & Richards, J. W. (2020). The privileged planet: how our place in the cosmos is designed for discovery. Gateway Editions.
 
        
             
        
        
        
No, a macromolecule is a large organic molecule
Hope this helps