Help asap Arturo needs to write an explanatory text on how the human circulatory system works.

Which of the following paragraphs would be the best introduction for his topic?

A.
The human circulatory system causes blood to circulate throughout the body. It is an amazing system.
B.
Of all the systems in the human body, the circulatory system may be the most complex. To understand it completely requires many years of study.
C.
The heart is the main component of the human circulatory system. It beats from 60 to 100 times per minute, about 100,000 times per day, more than 30 million times per year, and about 2.5 billion times in a 70-year lifetime.
D.
The human circulatory system is responsible for sending blood throughout the body, which provides it with oxygen and nutrients. The heart, the arteries, and the veins are just three of the parts that make up this amazing system.

the correct answer is the name of the author of the quotation appears at the text leading up to it   apex 2018

we have no idea what story or poem you mean? ?

explanation:

as we know, the english language is spoken all over the world by native and non-native speakers and has become the most certain tool when it comes to communicating. businesses, schools, even romantic relationships depend on it to keep thriving. in addition, it is the language of the internet not only because most of the content available is in english, but also because people prefer to use it when talking to others, since it's the language everyone supposedly learns.

yet, there have been some current claims that chinese will soon take over as the most important language in the world. china's magnitude has never been more evident and doing business with the chinese is a gold mine for any country. we now see language schools offering chinese courses as commonly as english.

however - even though we cannot deny china's importance and the advantage it is when someone takes the time to learn the language their business contact speaks-, people in general seem to be ignoring the aspects that seem to keep english as the chosen one of languages. one of them has been mentioned above: it is the language of the internet. also, chinese people are still learning english, since it opens doors in communicating with practically everyone else, from every single country.

note: if this is not the sort of transition you need, let me know. : d