Observen el mapa de la Hidrovia Paraguay-Paraná y respon- dan las siguientes preguntas (pueden ayudarse con un mapa de
América del Sur):
a) ¿Por qué paises pasa esta hidrovia?
b) ¿Qué ciudades comunica?
c) ¿Qué ríos desembocan en el Paraná y en el Paraguay?

The investiture controversy began as a power struggle between pope gregory vii (1072–85) and henry iv, holy roman emperor (1056–1106).[2] a brief but significant struggle over investiture also occurred between henry i of england and pope paschal ii in the years 1103 to 1107, and the issue played a minor role in the struggles between church and state in france, as well.by undercutting the imperial power established by the salian emperors, the controversy led to nearly 50 years of civil war in germany, and the triumph of the great dukes and abbots. imperial power was finally re-established under the hohenstaufen dynasty. historian norman cantor:

D.attorney because an attorney can in this situation

When a lake, river or other aquatic  system  becomes  eutrophic, it can have serious negative effects on other organisms like fish, birds and even people.if an algal bloom is so bad that it causes wide-spread death  in  the  water, the organisms that die will all sink to the bottom and start to decompose.

The answer is filtering so c