Magnesium reacts with oxygen and forms magnesium oxide , for examplevvMagnesium reacts with oxygen and forms magnesium oxide , for exampleMagnesium reacts with oxygen and forms magnesium oxide , for examplevvMagnesium reacts with oxygen and forms magnesium oxide , for examplevMagnesium reacts with oxygen and forms magnesium oxide , for example

5. method

15. communicate, transport

18. component

21. learn

22. preceding

23. display

24. area

25. anomalous, unusual, unconventional

keratin.

collagen.

elastin.

Explanation:

Elastin and collagen are found in the dermis and are produced by fibroblasts, are responsible for giving firmness, strength and elasticity to the skin.

Keratin is in the epidermis, this protein helps to preserve or recover the elasticity and firmness of the skin, also helps in cell regeneration and support the tissue where it accumulates.