Well recall we breath in oxygen, but release carbon. Carbon is the answer.
Answer:
Protein
Explanation:
Melanin is a protein that affects the color of our hair, skin, or animals fur.
I hope it helps! Have a great day!
Pan~
Cooking utensils need to be able to conduct heat well. Metal pots and pans are made out of the types of metals that make them such. This same type of metal though does not react chemically when placed in contact with heat. This characteristic is important when preparing food so as not to alter the taste. This is the reason why pots and pans are made out of metal.