Type of cell whose shape and structure enable it to perform a particular function

The right answer is  Specialized cell (or differenciated cell).

A specialized cell has a whole series of activated genes that contribute to its well-defined identity.

For example, an epidermis cell is a specialized cell: it produces keratin and divides into other epidermal cells ... its precise function, as well as its shape, its lifespan

In animals, once the cell is specialized, in general it is definitive! It is the plants, each cell can lose its specialization is becoming undifferentiated.

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."    

the correct answer is 2 and 4