The endosymbiotic theory is our best model for how eukaryotic cells got their mitochondria and chloroplasts. If some other organelles also existed as free-ling prokaryotes, what advantages might proto-eukaryotic cell have gained by endosymbiosis with them? Discuss two different membrane-bound organelles in your answer to get full points.
to de relate why proteins are the best suited to do all the work of the cell.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

protist eukaryotes that are not plants, animals, or fungi ("misfits")

the correct answer is b

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.