Which is the least sustainable practice.
a. finding new sources of geothermal energy
b. building more windmills
c. using coal to generate electricity
d. installing more solar panels

C. Using coal to generate electricity

Explanation:

Sustainable practice can be define as the practice which ensures the use of resources in a manner so that these resources remain available for the present as well as for the future generations.

C. is the correct option this is because of the fact that coal is the non-renewable resource. The excess use of coal for generation of electricity is likely to limit the concentration of coal available in a region. Hence, the use of coal cannot be considered as sustainable practice.      

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

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."