For energy resources, Poland's most important one is coal (and also lignite) which is mined in Upper Silesia in some large open pits mined there since the 19th century at least. It does have some petroleum in the Baltic Sea but still must import it from Russia.
Your answer would be B, Africa.
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Answer:
b. a theory
Explanation:
A theory is said to be a well structured explanation of a result in particular field of study. A theory tend to follow series of steps in an attempt to explain a result ;
Hypothesis : This is said to be a knowledgeable guess in the field of sciences.
Observation : The scientist engage in thorough study or observation of the experiment or facts he wants to establish.
Experiments : The scientist engage in series of experiments to back up his fact and observation.
A theory is propounded if it is testable . The theory must have passed through a series of scientific research to become an establish facts. It must pass numerous scientific investigation and often involving contribution from well meaning scientist in that domain. The theory must be simple , precise and express-able so it can be repeated by other scientist. This established fact should not contradict previous principles or theory but instead expand and agree with others.
Enabling habitation in warmer environments.
Work would be greatly reduced, if not completely shutdown when summer heat overwhelmed equipment and personnel.
Even paperwork: think of writing a letter or doing payroll with sweat dripping on the curled up humid papers!!
A/C is considered one of the most important of innovations in the 20th century.
Cooler, dehumidified factories and workspaces increased productivity exponentially.
