Answer:
option D: GABA ( gamma-aminobutyric acid )
Explanation:
The amount of neurotransmitters released during depression can not be properly measured. The neurotransmitters released due to anxiety are GABA, serotonin, Cck, and glutamate. 
The rise in level of neurotransmitter, GABA in depression causes anxiety. Thus, option D is correct.
 
        
             
        
        
        
Answer:
12. In our somatic (body) cells, we have 2N chromosomes, but in our sex cells (sperm & eggs), we have half the number of chromosomes, which is N chromosomes
Explanation:
 
        
             
        
        
        
A.  The waves would be exactly the same at points A and B.
Explanation:
The seismic waves at both point A and B would be exactly the same at the two points. 
Seismic waves are elastic waves that spreads out concentrically in all directions from their source. 
- Both S and P waves are body waves that moves within the earth. 
- In a seismic station, the p-waves or primary waves arrives first before the s-waves or secondary waves. 
- At any point equidistant from the epicenter, baring any geologic differences in the subsurface, the waves would be exactly the same at all points. 
Learn more: 
Locating the position of an earthquake brainly.com/question/11292835
#learnwithBrainly
 
        
             
        
        
        
The extermination of the dinosaurs, the start of a rise to dominance of mammals and a meteorite effect in mexico marks the boundary among the mesozoic and the cenozoic or as named as the k-p boundary. In addition, the cretaceous paleogene (K–Pg) boundary which is previously recognized as the cretaceous tertiary (K–T) boundary is a geological signature typically a thin band of rock.