The author draws a contrast between metals and other materials in all of the following EXCEPT: Flint, wood, and bone are more brittle.

Metals are reusable.

Metals are non-polluting.

Metals can be shaped into other objects.

i don't think it's a good idea to threaten anyone at all.

i think its c

independent

services provided to people and organizations.answer

. a function is a relation in which each input has only one output. in the relation , y is a function of x, because for each input x (1, 2, 3, or 0), there is only one output y. x is not a function of y, because the input y = 3 has multiple outputs: x = 1 and x = 2.