After the supernova in a star’s life cycle, what else is formed in addition to a nebula? red giant or protostar neutron star or red giant protostar or black hole black hole or neutron star

black hole or neutron star

Explanation:

When a very massive star reaches its end, it runs up on its fuel. The nuclear fusion reaction in the core stops and the star goes supernova. Most of the mass and radiation is expelled out in few seconds. The event is brighter than the brightness of the entire galaxy. The remaining core after supernova collapses to form either a neutron star or a black-hole along with a nebula.

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.

but there is no

i guess you forgot putting it.