Answer:
First: Check for spelling or grammar mistake, and fix those. Second, check the formatting and structure, you could have the most perfectly grammatically correct piece of writing, ruined by the fact that nothing is in order. Thirdly, look at words and phrases to make sure you are not using any ambiguous language.
The method of heat transfer that does not require a medium is radiation. Heat may be transmitted across void space through thermal radiation, commonly known as infrared radiation.
No mass is transferred and no medium is required during radiation. Radiation is the only method of heat transmission that does not need a substance, such as the heat released by the sun or the filament of a light bulb. There is no material medium necessary for the propagation of electromagnetic waves, often known as radiation. Only in a vacuum can we observe the perfect transfer of energy, because when radiation travels through material, part of its energy is lost. (Subject to the material property)
Conversely, in the instance of Conduction.
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Answer: It's the first choice:)
Hope this help:)
For the first one the correct answer is variant A because of the appositive developed phrase ' <span>grown in many parts of the world ' .
For the second one the correct answer is variant B because that sentence doesn't need any comma's like the other ones.</span>
