How many neutrons does element x have if its atomic number is 54 and its mass number is 161

a. by using fur or clothes to trap heat energy near the body

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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bioteacher101