The correct answer is C. Sediment Pollution.
It’s all atoms have the same number of protons. I looked all of them up and that one was true soo I think that’s right
The answer would be the sandbag wall.
Stacks of sandbag will be put in front of the trench to protect the soldier. When the soldier stands inside trench all of his body is covered. But when he stands on trench board, the height increased so that the chest might be exposed. Sandbad will be helpful to stop the bullet that aimed at the chest region.
They spend more time in their den, and they also put on "layers of fat" to have fat reserves to fall back on since they'll be less food in the winter :)
