In what ways did world war 1 represent a frightening new kind of warefare?

The trench warfare and gas attacks.

Explanation:

During WW1, there were trenches dug up by the soldiers. Any land between the trenches was called no man's land. This is because Bullets, gas bombs, and all sorts of new weaponry was being used into overdrive. The gas, as I was referring to,  was extremely toxic and dangerous. An example would be the mustard gas- tasteless, odorless, and colorless, it was virtually unidentifiable at the time. It could seep through the clothes and armor, cause blisters and severe burns, and make you very sick. Men had to get amputations because of the wounds and infection caused by the gas.

answer; /// i believe that the correct answer is (a) making presentations;

d is the correct answer.

b is incorrect because it makes food by itself

c is incorrect because us humans don't know how to produce their own food using the sun like plants.

a is incorrect because consumers can depend on carnivores for eating food for consumers to eat the dead organism. same thing with omnivores.