02.04 lc)

identify the selectively permeable barrier of the cell that allows certain molecules to enter and exit the cell?

  a  c  e  f

Hello. It is not possible to see the letter in the image, which determines the selectively permeable barrier of the cell that allows certain molecules to enter and exit the cell. It is the only letter that cannot be viewed. It can be a "C" or an "F".

Explanation:

The plasma membrane is the selectively permeable barrier of the cell that allows certain molecules to enter and exit the cell.

The plasma membrane is a structure present in all cells, both eukaryotes and prokaryotes, and it is it that separates the interior of the cells from the external environment. It is not for nothing that this wrap is present in all known cell types. It has an extremely important characteristic for the maintenance of life: the selective permeability. This basically means that everything that goes in and out of the cells depends directly on the plasma membrane.

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."    

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.