Measurable factors which are used to quantify pollution or the quality of the water​

Physical: It includes the measurement of water temperature, turbidity, total suspended particle in the water sample. Chemical: It includes the measurement of pH value, Chemical Oxygen Demand(COD) and Biological Oxygen Demand(BOD.

Explanation:

they are second messenger molecules capable of triggering different signaling pathways

Explanation:

Second messenger molecules are intracellular signaling molecules that trigger different cellular responses. Examples of second messengers include Calcium ions (Ca2+), Inositol trisphosphate (IP3), and cyclic AMP (cAMP). Secondary messengers may be activated by different cellular responses, for example, cyclases that synthesize cAMP or by opening calcium ion (Ca2+) channels. For example, cAMP signaling is able to activate kinase enzymes that perform phosphorylation and interact with other effector molecules to mediate different biological functions (for example, regulation of glycogen and sugar metabolism). On the other hand, Ca2+ signaling is required for muscle contraction, neurotransmitter release, etc. Ca2+ signaling is known to exert allosteric control over enzymes and other types of proteins.