Vocabulary specific to a subject is called technical vocabulary. For example: A Year 1 science unit on living things may require words that are not yet part of students' vocabulary – habitat, prey, offspring.
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The answer is D - explanation of nature
Answer: but
Explanation:
In 1863, President Abraham Lincoln designated the last Thursday in November as a national holiday of Thanksgiving ....... in 1939, President Franklin Roosevelt decreed that the holiday should always be celebrated on the fourth Thursday of the month.
Out of the options given, the answer is "but". This is the right answer as it'll be used to link both sentences regarding the two activities of the President's together.
The other options such as "for example", "therefore" and "so" when used doesn't make the sentence correct.
