He have four effects of the introduction of steam-powered machinery, and they were all things that did happen. So the answer will be looking for a non-economic effect rather than for something that was not an effect.
Such non-economic effect is the increase in pollution. It is an environmental effect that might have some very mild economic effects (it might for example decrease tourism), but it's not generally an economic effect.
A Male Goat. Buck is slang for a male goat.
The sentence that uses a verb that agrees with its subject is D. Here are some new stamps from the post office.
Subject - Stamps (plural) Verb - are (plural)
A) Subject - Buildings(plural) Verb used - hides (singular) should be: hide (plural)
B) Subject - Minerals (plural) Verb used - is (singular) should be: are (plural)
C) Subject - Athlete (singular) Verb used - sit (plural) should be: sits (singular)
