Light alerts the biological clock to slow down the secretion of melatonin hormone that promotes sleep. Melatonin hormone is a hormone that is produced by the pineal gland in animals and regulates sleep and wakefulness. . The hormone is used to regulate night and day cycles or sleep-wake cycles, darkness causes the body to produce more melatonin, which signals the body to prepare for sleep. Light decreases melatonin production and signals the body to prepare being awake.
Different amino acids means difference DNA sequences, which means they are distantly related.
Further understanding: if you look at identical twins, they are closely related to each other because they have almost the same DNA, which will code for the same amino acids, which will lead to the same phenotype or appearance.
To summarize, the greater the amino acid differences the less related they are and vice versa
Hope that helps
Answer;
-Aggressive behavior
Dr. Han is studying what brain structure is associated with aggressive behavior among rats and is most likely to see the amygdala activated when using neuroimaging techniques.
Explanation;
-Aggression is a fascinating and distressing topic for the pet rat owner. We are normally intrigued or amused by aggressive behaviors like chasing and sidling, but we hate it when our pets hurt each other.
-Aggressive behaviors are strung together into sequences that vary in their intensity and duration. The lowest intensity encounters are chases.
Ummmm I believe that the answer is C i'm not a hundred percent sure
