How was feudalism a reciprocal relationship?

Both of these aspects are key to understanding feudalism. Reciprocity lies in the fact that the senior party to any relationship provided land and oversight to the junior party, who in turn was expected to provide his lord with economic and military support.

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.