HELP ME QUICK!! Which of the following describes how the skin of the integumentary system and the bones of the skeletal system work together in the human body?

A. The skin absorbs nutrients from the external environment and the bones transport them around the body.

B. The skin takes in oxygen from the external environment, and the bones convert it into carbon dioxide.
The skin takes in oxygen from the external environment, and the bones convert it into carbon dioxide.

C. The skin attaches to the bones of the body and relaxes or contracts in order to allow the human body to move.

D. The skin produces vitamin D when exposed to sunlight which helps calcium be absorbed by the bones.

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."    

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called

the answer is c. altitude. hope this ! #brainiac