How long does it take a 100.0 g sample of As-81 to decay to 6.25g? How long does it take a180 g sample of Au-198 to decay to 1/8 its original mass?

What is the half-life of a radioactive isotope if a 500 g sample decays to 62.5g in 24.3 hours?

How old is a bone if it presently contains 0.3125 g of C-14, but it was estimated to have originally contained 80.0 g of C-14?

Thallium-208 has a half-life of 3.053 minutes. How long will it take for 120.0 grams to decay to 7.50 grams?

the supermassive black hole is in the middle of the galaxy.

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.

layer 3 is younger than layer 6.