How does the hydroelectric dam picture here impact the environment?

by releasing toxic chemicals in their emissions

by generating significant heat that artificially warms nearby water

by producing greenhouse gases

by blocking fish migration

By blocking fish migration

Explanation:

By releasing toxic chemicals in their emissions

 Hydroelectrics only emissions are usually, non harmful electromagnetic signals.

By generating Significant heat that artificially warms nearby water

  Possible, but they do not produce much significant heat

By producing greenhouse gases

   No, just no- its magnets that are water moved, no room for greenhouse gasses..

By blocking fish migration

It is a dam, blocking a river, with fish in it.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.