Can someone help me on this question please I really need help

Silica, sio2, is formed on silicon as an electrically insulating layer for microelectronic devices. silica is formed when silicon is exposed to o2 gas at an elevated temperature. at 900˚c, it takes 90 minutes for the oxygen to diffuse from the surface to form a 0.06 micron (0.06 x 10-6 m) thick layer of sio2 on

The ph of carrots are 5.0 how it is classified a. acidic b. basic c. indicator d. neutral

Llama have 74 chromosomes how many chromosomes will they be found in their gametes explain how you know