Filters are used in many heating and air conditioning units to make sure the air is as “pure” as possible when it blows out into the room. How are plants like nature’s filters?

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explanation:

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bradykinin is a physiologically and pharmacologically active peptide of the kinin group of proteins, consisting of nine amino acids.

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

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