Can someone help me with this? anyone?

a. poison gas was sprayed over battlefields by airplanes to weaken enemy positions before major attacks.

which specific shipwreck are you talking about?

the united states broke it's neutrality was the constant german sinking of trading vessels resulting in the loss of lives, one example would be the lusitania.

the lines on a surface map are called isobars. isobars are lines of constant pressure which are measured in units called millibars. the numbers indicate the amount of air pressure, in millibars, that each line represents.