The brightest star in the universe, a supernova, is thought to be about a million times brighter than our own sun. if polaris, located about 434 light years from earth, were to go supernova today, why would no one currently on earth ever know it happened?
a) it would take the light 434 years to reach the earth.
b) the light would be so dim that our eyes would not detect it.
c) the light would be so bright that or eyes could not detect it.
d) the light from the supernova would never reach the earth as it would travel in a different direction.

If Polaris were to go supernova today, no one currently on Earth ever know it happened because it would take 434 light years to reach the Earth

Explanation:

The Polaris or the North Star that we can see at the North Pole of the Earth in the night historically dates back to 434 years in the past. If the Polaris becomes a supernova or if it dies now, it will take 434 years in the future from now to know about it.

This is simply because ‘one light year is the distance traveled by light in one year’. Hence currently, one cannot know about what happened to the Polaris supernova even if it happens now.

it has to be understood that the sea water contains a huge amount of sodium and chlorine ions and if they enter the cell of the atlantic cod fish, the cell will shrivel and the fish will die. to avoid such a condition, the fish uses active transport for the purpose of removing the ions against the gradient.

explanation:

the atlantic cod is not a maritime osmoconformer. its native application of salts is less than that of the seawater it lives in. it is continually falling water from the gills to the ocean via osmosis.

countering that, the fish is going to be swallowing seawater. but since its internal collection of salts is lower than seawater, the fish will want to go free of excess salt, and since that's going upon a gradient, then active transport, requiring energy, must be used to pump out the salt. much marine fish use the organs to filter out the salt and these fish discharge very straight urine.