13. A recreational experience among life forms and ecosystems is called
14. Any species with a declining population that could become endangered is a(n)
is any species likely to become extinct if it is not
15. A(n)
protected.

the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

explanation:

i think the answer would be a. after sentence 14! i hope i at least a little

la transducción de señal ocurre cuando una molécula de señalización de fluido extracelular activa un receptor de superficie de la célula.