Atype of junction between cells that allows the passage of small molecules and ions from cell to cell is a

Gap junction

Explanation:

They are also called nexus or Macula communicans

These are specialized inter-cellular connections between a group of cells that directly connects the cytoplasm of two cells allowing passage of small molecules, ion and electric impulses.

They occur in almost all cells except sperm cell, erythrocytes and fully developed skeletal muscles. Gap junction are not found in simpler organisms such as sponges and slime molds.

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.

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