These straps are used to bind the batim to one's arm/hand (Tefillin shel Yad) and to one's head (Tefillin shel Rosh) in obedience to Deuteronomy 6:8 (And thou shalt bind them for a sign upon thine hand, and they shall be as frontlets between thine eyes).
Given that a single mangrove area can produce as much as four tons of detritus per year, the mud crab's work as a decomposer is a primary part of the detritus-based food ecology that supports fisheries populations.
These are the herbivores and carnivores of the ecosystem. By eating other organisms they gain both food as an energy supply and nutrient molecules from within the biomass ingested. For instance to build new protein consumers have to eat protein contain amino acids. Decomposers are the waste managers of any ecosystem. The are the final link in a foodweb breaking down dead organic matter (DOM) from producers and consumers and ultimately returning energy to the atmosphere in respiration and inorganic molecules bake to the soil during decomposition.