Specialized neurons in the brain respond to changes in blood osmolarity (solute concentration). When blood osmolarity strays outside the homeostatic range, these neurons release a neurotransmitter that stimulates neurons of the posterior pituitary, which respond by releasing a different chemical into the blood that will travel via the circulatory system to the kidneys. How would you classify this type of simple reflex.

velocity and height

more words for this could be abiotic and biotic

abiotic: living organisms within an ecosystem

biotic: non-living organisms within an ecosystem

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.