Q20: Covalent and metallic bonding both involve interactions between atomic nuclei and valence electrons. ► Which of the following is a similarity between covalent and metallic bonding?
A They can link atoms into periodic
lattices.
B They are easily broken at room temperature.
c They always involve a "sea” of delocalized electrons.
D They are nondirectional.
E They can link atoms into separate molecules.
Which of the following is a difference between covalent and metallic bonding?
A Only covalent bonding can occur between atoms of different elements.
BOnly metallic bonding can involve more than one valence electron per bonded atom.
C Only metallic bonding can occur between oppositely charged ions.
D Only covalent bonding can produce materials that are electrically insulating.
E Only metallic bonding can produce materials that are electrically conductive.

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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.

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.