It deals with opportunity costs. Opportunity costs are not real costs, but rather the things that you had to give up in order to obtain something else. What you didn't obtain is considered to be an opportunity cost. A production possibility curve deals with this.
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Answer: Right to life/liberty, freedom from slavery, freedom of opinion and right to work/education
Explanation:
A dependent variable is something you control, so probably drugs (as the researcher will ensure that they stay drug free)
The answer is annual grass weeds.
Preemergence herbicides typically been the most effective and preferred to control the annual grass weeds. Preemergence herbicides are widely used to control the weeds that are grown in lawns and if we use this herbicides many weeks before the germination of weeds, it will be very effective.
Answer:
They developed many new techniques for buildings and invented, concrete,roman roads, arches, and aqueducts
Explanation:
