А. Н
— с
Ес - Н
В.
Н
се с
H
с.
Н
- C = C
Н
D.
H
с
Ес-
Н
Which is the correct Lewis structure
acetylene (СН2)?

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

let that person have a turn to speak : )