1) En esta red alimenticia, ¿Quiénes son los productores? ¿y los consumidores primarios? ¿hay algún animal que no tenga depredador? 2) ¿Cuál es la cadena trófica en la que está implicada el caracol?

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.