Orexin is a hormone secreted by the hunger-arousing; hypothalamus hunger-suppressing; hypothalamus hunger-arousing; stomach hunger-suppressing; stomach

The right answer is: hunger-arousing and hypothalamus.

Orexin (also called hypocretin) is a neurotransmitter of the brain. Orexin neurons are located in the hypothalamus. They play an important role in hunger and maintaining wakefulness and inhibition of paradoxical sleep. Their dysfunction can lead to narcolepsy.

i do not know and i have a 100 in this class

carbohydrates: (starches and sugars) composed of carbon, hydrogen, and oxygen.

lipids: (fats, oils, and waxes) are made of carbon and hydrogen atoms.

nucleic acids: contain hydrogen, oxygen, nitrogen, carbon, and phosphorus. they are polymers of nucleotides. a nucleotide has three parts, a 5-carbon sugar, a phosphate     (-po⬇️4) group, and a nitrogenous base.

proteins: made up of nitrogen, carbon, hydrogen, and oxygen. they are polymers of amino acids.