Answer:
<em>The correct option is D) to maintain the diversity of the living environment</em>
Explanation:
Forests, such as the oak forest, are of utmost ecological importance as they are rich in wild-life animals and plants. They biodiversity in such areas is huge as there are different types of plants and animals living here. Even if we have to cut down a forest, we should try to protect a section of it so that all this huge biodiversity is not lost. Cutting down the whole oak forest will result in no habitat for the different animals that lived there. As a result, many species of organisms might become extinct.
The railroad industry used coal to power steam engines, allowing businesses to build more factories for the production of goods.
Explanation:
It is also during the 1800s that the use of coal power enabled the smelting of iron and steel, in addition to the powering of steam engines. Coal and steam engines enabled the building of railroads to transport goods from industries.
Before the discovery of coal in the 1600s, energy was sourced from water wheels and the burning of biomass.
In addition. 1950s saw coal production decline to its lowest levels because it was overtaken by petroleum as the main source of energy.
Learn More:
For more on coal check out;
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Answer:
Neither observer nor subjects know which subject receives the vaccine and which receives a placebo
Explanation:
In a double-blind study neither the participants nor the experimenters is aware of who is receiving a particular treatment.
Its used to prevent bias in research results from demand characteristics or the placebo effect
Scientific methods are very important for experiments and to explore hypothesis.
Without it we wouldnt even know what the moon is or other planets in this galaxy, scientific method is important to explore and learn the beauty of this planet and galaxy
