The activation of the suprachiasmatic nucleus is stimulated by the presence of the light waves. This activation leads to the release of the hormone serotonin. Serotonin promotes the wake cycle of the person along with his internal clock. However, when the light is absent, then the pineal gland, which is present at the top of the middle of the brain, secretes the hormone melatonin. The melatonin regulates the sleep cycle of the person.
Hence, the blanks can be filled with 'serotonin and melatonin' respectively.
The correct option is B.
Coastal cities usually have large bodies of water around them while cities in the middle of continent have land masses surrounding them. One of the unique property of water is its relative high heat specific capacity. It takes a lot of heating before there will be significant change in the temperature of water, thus, cities around water bodies tend to experience more stable temperature. Land masses on the other hand does not absorb heat like water, thus, there is higher rate of climate fluctuation.
Diffusion is important to organisms because it is the process by which useful molecules enter the body cellsand waste products are removed. Digested food molecules (amino acids, glucose) move down a concentration gradient from the intestine to the blood.
Both have 3 nitrogenous bases; adenine, cytosine, and guanine
Physical Weathering would be nature related like the wind or rain. Chemical Weathering would be anything caused by a chemical reaction like acids or acidic rain.
I think that should help. If not let me know!
